diff --git a/.eslintignore b/.eslintignore
index b17c0fc37..aadfab62b 100644
--- a/.eslintignore
+++ b/.eslintignore
@@ -10,3 +10,4 @@ translations
 storybook-static
 updates
 flow-typed
+/**/*.d.ts
diff --git a/.gitignore b/.gitignore
index 8d692d1bd..634c41431 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,3 +9,4 @@ bin/test-data
 translations
 storybook-static
 updates
+temp-resources
diff --git a/bin/build-translations.js b/bin/build-translations.js
index de79b3e05..51d1a92f4 100755
--- a/bin/build-translations.js
+++ b/bin/build-translations.js
@@ -9,14 +9,13 @@ const fs = require('fs')
 
 const readFile = util.promisify(fs.readFile)
 const writeFile = util.promisify(fs.writeFile)
-const mkdirpPromise = util.promisify(mkdirp)
 
 async function readJson (file) {
   return JSON.parse(await readFile(file))
 }
 
 async function writeJson (file, data) {
-  await mkdirpPromise(path.dirname(file))
+  await mkdirp(path.dirname(file))
   await writeFile(file, JSON.stringify(data, null, 2))
 }
 
diff --git a/bin/extract-presets.js b/bin/extract-presets.js
new file mode 100644
index 000000000..f05cd523a
--- /dev/null
+++ b/bin/extract-presets.js
@@ -0,0 +1,19 @@
+const path = require('path')
+const mkdirp = require('mkdirp')
+const fs = require('fs-extra')
+const { DEFAULT_CONFIG_DIR } = require('../config')
+
+// This is a really hacky fix to an annoying problem. Currently mapeo-server has
+// a fallbackPresetsDir option, but it expects the presets to be in a `default`
+// subfolder inside that. In production we copy mapeo-default-settings into the
+// app resources folder, with a `default` subfolder, but in dev we need to copy
+// the default presets into a subfolder so we can use them in dev. TODO: Fix the
+// API for mapeo-server
+
+// Sorry about confusing naming, working around hard-coded paths in @mapeo/settings
+const defaultConfigFolder = path.join(DEFAULT_CONFIG_DIR, 'default')
+mkdirp(defaultConfigFolder)
+fs.copySync(
+  path.dirname(require.resolve('mapeo-default-settings')),
+  defaultConfigFolder
+)
diff --git a/builder.config.js b/builder.config.js
index fc35693c5..d23b48069 100644
--- a/builder.config.js
+++ b/builder.config.js
@@ -61,6 +61,10 @@ const config = {
     {
       from: 'build/app-update.yml',
       to: 'app-update.yml'
+    },
+    {
+      from: path.dirname(require.resolve('mapeo-default-settings')),
+      to: 'presets/default'
     }
   ]
 }
@@ -75,9 +79,8 @@ const files = [
   // Don't ship built sourcemaps, because they are 25Mb
   '!static/*.map',
   // Include everything in src/ apart from src/renderer
-  'src/main/**/*',
-  'src/background/**/**/*.{js,html}',
-  'src/*.js',
+  'src/**/*',
+  '!src/renderer/**/*',
   // but also include src/renderer/index-preload.js since this is not included
   // in the renderer bundle
   'src/renderer/index-preload.js',
diff --git a/config.js b/config.js
index 3775e9a43..1753fb653 100644
--- a/config.js
+++ b/config.js
@@ -1,14 +1,30 @@
+var path = require('path')
 var APP_NAME = 'Mapeo'
 var APP_TEAM = 'Digital Democracy'
 var APP_VERSION = require('./package.json').version
 
-module.exports = {
-  APP_NAME: APP_NAME,
-  APP_TEAM: APP_TEAM,
-  APP_VERSION: APP_VERSION,
+var isElectron = typeof process.type === 'string'
+// Is `true` when running from Node
+var isDev = isElectron ? require('electron-is-dev') : true
 
-  MAPBOX_ACCESS_TOKEN: 'pk.eyJ1IjoiZ21hY2xlbm5hbiIsImEiOiJSaWVtd2lRIn0.ASYMZE2HhwkAw4Vt7SavEg',
+// Sorry about this! In production the default config is shipped in the app
+// resources folder, but for development we need to copy them into a temporary
+// "resources" folder.
+var RESOURCES_DIR = isDev
+  ? path.join(__dirname, 'temp-resources')
+  : process.resourcesPath
 
+module.exports = {
+  APP_NAME,
+  APP_TEAM,
+  APP_VERSION,
+  RESOURCES_DIR,
+  // This is super confusing... due to hard-coded paths in @mapeo/settings
+  // TODO: Clean all of this up in mapeo-server and @mapeo/settings
+  DEFAULT_CONFIG_DIR: path.join(RESOURCES_DIR, 'presets'),
+  MAPBOX_ACCESS_TOKEN:
+    'pk.eyJ1IjoiZ21hY2xlbm5hbiIsImEiOiJSaWVtd2lRIn0.ASYMZE2HhwkAw4Vt7SavEg',
   GITHUB_URL: 'https://github.com/digidem/mapeo-desktop',
-  GITHUB_URL_RAW: 'https://raw.githubusercontent.com/digidem/mapeo-desktop/master'
+  GITHUB_URL_RAW:
+    'https://raw.githubusercontent.com/digidem/mapeo-desktop/master'
 }
diff --git a/index.js b/index.js
index 217f18459..6df9ed607 100755
--- a/index.js
+++ b/index.js
@@ -1,25 +1,15 @@
 #!/usr/bin/env electron
+
 const path = require('path')
 const minimist = require('minimist')
-const electron = require('electron')
-const isDev = require('electron-is-dev')
-const contextMenu = require('electron-context-menu')
+const { app } = require('electron')
 const debug = require('electron-debug')
-const mkdirp = require('mkdirp')
-const series = require('run-series')
-const styles = require('mapeo-styles')
-const chmod = require('chela').mod
-
-const app = electron.app
-const BrowserWindow = electron.BrowserWindow
+const isDev = require('electron-is-dev')
 
-const createMenu = require('./src/main/menu')
-const updater = require('./src/main/auto-updater')
-const userConfig = require('./src/main/user-config')
-const Main = require('./src/main')
 const logger = require('./src/logger')
-const electronIpc = require('./src/main/ipc')
-const windowStateKeeper = require('./src/main/window-state')
+const startApp = require('./src/main')
+const cleanUpOrphanProcesses = require('./src/main/pid-cleanup')
+const getPorts = require('./src/utils/get-ports')
 
 // Path to `userData`, operating system specific, see
 // https://github.com/atom/electron/blob/master/docs/api/app.md#appgetpathname
@@ -34,8 +24,8 @@ var argv = minimist(process.argv.slice(2), {
   default: {
     port: 5000,
     datadir: path.join(userDataPath, 'kappa.db'),
-    tileport: 5005,
-    mapPrinterPort: 5010
+    tileport: 5100,
+    mapPrinterPort: 5200
   },
   boolean: ['headless', 'debug'],
   alias: {
@@ -49,398 +39,73 @@ var argv = minimist(process.argv.slice(2), {
 // See https://github.com/sindresorhus/electron-debug
 debug({ showDevTools: false })
 
-var exiting = false
-
-// Before we do anything, let's make sure we're ready to gracefully shut down
-const onExit = require('capture-exit')
-const signalExit = require('signal-exit')
-onExit.captureExit()
-onExit.onExit(beforeQuit)
-signalExit(beforeQuit, { alwaysLast: true })
-app.on('before-quit', (e) => {
-  // Cancel quit and wait for server to close
-  if (e) e.preventDefault()
-  beforeQuit()
-})
-
-// Window Management
-var win = null
-var splash = null
-var mainWindowState = null
-var didFinishLoad = false
-
-// Ensure only one instance can be open at a time
-var gotTheLock = app.requestSingleInstanceLock()
-if (!gotTheLock) {
-  // Didn't get a lock, because another instance is open, so we quit
-  process.exit(0)
-} else {
-  app.on('second-instance', () => {
-    // Someone tried to run a second instance, we should focus our window.
-    if (win) {
-      if (win.isMinimized()) win.restore()
-      win.focus()
-    }
-  })
-}
-
 // Configure the logger before we do anything
 if (!logger.configured) {
   logger.configure({
     label: 'main',
-    userDataPath,
-    isDev
+    userDataPath
   })
 }
 
-// Set up Electron main process manager
-const main = new Main({
-  userDataPath,
-  isDev
-})
-
-function ipcSend (...args) {
-  try {
-    if (win && win.webContents) {
-      win.webContents.send.apply(win.webContents, args)
-      return true
-    } else return false
-  } catch (e) {
-    logger.error('exception win.webContents.send', args, e.stack)
-    return false
-  }
-}
-
-function onError (err) {
-  if (!ipcSend('error', err.toString())) {
-    electron.dialog.showErrorBox('Error', err.toString())
-  }
+// Ensure only one instance can be open at a time
+var gotTheLock = app.requestSingleInstanceLock()
+if (!gotTheLock) {
+  logger.debug('Another instance of Mapeo is already open, exiting.')
+  // Didn't get a lock, because another instance is open, so we quit
+  process.exit(0)
 }
 
-main.on('error', onError)
-
-if (argv.headless) main.ready().then(startSequence())
-else {
-  app.whenReady().then(() => {
-    splash = createSplashWindow()
-    splash.on('closed', () => {
-      beforeQuit()
-    })
-    splash.webContents.on('did-finish-load', openWindow)
-  })
-}
+;(async () => {
+  // Cleanup any orphaned processes that might be left from the app not closing
+  // gracefully last time it loaded. Do this before trying to find available
+  // port (since orphaned process could be occupying port)
+  await cleanUpOrphanProcesses()
 
-// First, open the Electron 'splash' AKA loading window with animation
-function openWindow () {
-  logger.info('openWindow')
+  // Wait for Electron to finish initializing
+  await app.whenReady()
 
   if (isDev) {
     // for updater to work correctly
-    process.env.APPIMAGE = path.join(__dirname, 'dist', `Installar_Mapeo_v${app.getVersion()}_linux.AppImage`)
+    process.env.APPIMAGE = path.join(
+      __dirname,
+      'dist',
+      `Installar_Mapeo_v${app.getVersion()}_linux.AppImage`
+    )
     try {
+      // DevTools do not load in Electron v9 see
+      // https://github.com/electron/electron/issues/24011
       var {
         default: installExtension,
         REACT_DEVELOPER_TOOLS
       } = require('electron-devtools-installer')
-    } catch (e) {}
-    installExtension(REACT_DEVELOPER_TOOLS)
-      .then(name => logger.debug(`Added Extension:  ${name}`))
-      .catch(err => logger.error('Failed to add extension', err))
-  }
-
-  // When the main process is ready to go
-  var onMainReady = () => {
-    win = createWindow(main.mapeo.name)
-    // Emitted when the window is closed
-    win.on('closed', function (e) {
-      beforeQuit()
-    })
-
-    createMenu(main.mapeo.ipc)
-
-    // Start Mapeo core
-    // In dev mode, we use an electron background window
-    // for the mapeo core process so we can use the chrome debugger
-    // In production, mapeo core should always be in a node process
-    if (isDev) {
-      // this will get destroyed on app.exit()
-      var BG = 'file://' + path.join(__dirname, './src/background/mapeo-core/index.html')
-      createBgWindow(main.mapeo.name, BG)
-    } else {
-      // this will get destroyed during beforeQuit with main.close()
-      main.startMapeoNodeIPC()
+      const name = await installExtension(REACT_DEVELOPER_TOOLS)
+      logger.debug(`Added Extension:  ${name}`)
+    } catch (err) {
+      logger.error('Failed to add extension', err)
     }
-
-    // Start map printer
-    // this will get destroyed on app.exit()
-    var BG2 = 'file://' + path.join(__dirname, './src/background/map-printer/index.html')
-    createBgWindow(main.mapPrinter.name, BG2)
-
-    // Start sequence
-    startSequence()
   }
 
-  const mainReady = main.ready()
-  mainReady.then(onMainReady).catch(onError)
-}
-
-// Some convenience function for logging
-function startupMsg (txt) {
-  return function (done) {
-    logger.debug('[STARTUP] ' + txt)
-    done()
-  }
-}
-
-function startSequence () {
-  // The app startup sequence
-  series(
-    [
-      initDirectories,
-      startupMsg('Initialized directories'),
-
-      createServers,
-      startupMsg('Started node-ipc servers'),
-
-      notifyReady,
-      startupMsg('Notified the frontend that backend is ready')
-    ],
-    function (err) {
-      if (err) logger.error('STARTUP FAILED', err)
-      else logger.debug('STARTUP success!')
-    }
-  )
-}
-
-function initDirectories (done) {
-  startupMsg('Unpacking Styles')
-  // This is necessary to make sure that the directories
-  // are writable by the user
-  mkdirp.sync(path.join(userDataPath, 'styles'))
-  mkdirp.sync(path.join(userDataPath, 'presets'))
-  mkdirp.sync(argv.datadir)
-
-  styles.unpackIfNew(userDataPath, function (err, newSettings) {
-    if (err) logger.error('Error while unpacking styles:', err)
-    var fallbackSettingsLocation = path.join(userDataPath, 'presets', styles.FALLBACK_DIR_NAME)
-    if (newSettings) userConfig.copyFallbackSettings(fallbackSettingsLocation, cleanupPermissions)
-    else cleanupPermissions()
-  })
-
-  function cleanupPermissions () {
-    chmod(path.join(userDataPath, 'presets'), '0700', (err) => {
-      if (err) logger.error('Failed to execute chmod on presets', err)
-      chmod(path.join(userDataPath, 'styles'), '0700', (err) => {
-        if (err && !err.message.includes('asar')) logger.error('Failed to execute chmod on styles', err)
-        done()
-      })
-    })
-  }
-}
-
-function createServers (done) {
-  // Set up Electron IPC bridge with frontend in electron-renderer process
-  electronIpc(ipcSend)
-
-  // Start Mapeo HTTP Servers
-  const opts = {
-    userDataPath,
-    datadir: argv.datadir,
-    port: argv.port,
-    tileport: argv.tileport
-  }
-  logger.info('initializing mapeo', opts)
-  main.mapeo.ipc.send('listen', opts, function (err) {
-    if (err) throw new Error('mapeo-core listen failed', err)
-    const mapPrinterPort = argv.mapPrinterPort
-    logger.info('initializing map printer', mapPrinterPort)
-    main.mapPrinter.ipc.send('listen', mapPrinterPort, function (err) {
-      if (err) logger.error('MAP PRINTER FAILED', err)
-      global.osmServerHost = '127.0.0.1:' + opts.port
-      global.mapPrinterHost = '127.0.0.1:' + mapPrinterPort
-      done()
-    })
-  })
-}
-
-// Wait for in-app window contents to finish loading
-// and server to finish starting before closing Loading splash screen
-// and showing the window
-function notifyReady (done) {
-  logger.info('Server ready, checking front-end is loaded')
-  // If the window is still loading, wait for it to finish before continuing
-  // win.webContents.isLoading() does not seem to work here on Windows
-  if (!didFinishLoad) {
-    logger.info('Front-end still loading, check again once loaded')
-    win.webContents.once('did-finish-load', () => {
-      didFinishLoad = true
-      notifyReady(done)
-    })
-    return
-  }
-
-  var IS_TEST = process.env.NODE_ENV === 'test'
-  if (IS_TEST) win.setSize(1000, 800, false)
-  if (argv.debug) win.webContents.openDevTools()
-  // notify renderer that server is ready
-  // TODO: Send host and port here too, rather than via global
-  win.webContents.send('back-end-ready')
   try {
-    win.maximize()
-    splash.hide()
-    win.show()
-  } catch (err) {}
-  // Start checking for in-app updates
-  updater.periodicUpdates()
-  done()
-}
-
-function createWindow (socketName) {
-  if (!socketName) throw new Error('socketName required')
-  var APP_NAME = app.getName()
-  var INDEX = 'file://' + path.join(__dirname, './static/main.html')
-  mainWindowState = windowStateKeeper({
-    defaultWidth: 1000,
-    defaultHeight: 800
-  })
-  var mainWindow = new BrowserWindow({
-    x: mainWindowState.x,
-    y: mainWindowState.y,
-    width: mainWindowState.width,
-    height: mainWindowState.height,
-    title: APP_NAME,
-    show: false,
-    alwaysOnTop: false,
-    titleBarStyle: 'hidden',
-    icon: path.resolve(__dirname, 'static', 'mapeo_256x256.png'),
-    webPreferences: {
-      nodeIntegration: true,
-      preload: path.resolve(__dirname, 'src', 'renderer', 'index-preload.js')
-    }
-  })
-  mainWindowState.manage(mainWindow)
-
-  mainWindow.webContents.on('did-finish-load', () => {
-    logger.info('Front-end has finished loading')
-    didFinishLoad = true
-    if (process.env.NODE_ENV === 'test') mainWindow.setSize(1000, 800, false)
-    if (argv.debug) mainWindow.webContents.openDevTools()
-    mainWindow.webContents.send('set-socket', { name: socketName })
-    // 'did-finish-load' can fire before the backend server is ready, or when
-    // the user refreshes the main window. On window refresh the notifyReady()
-    // function will not run, so we use `global.osmServerHost` to check whether
-    // the server is ready, and notify the front-end if it is
-    if (global.osmServerHost && global.mapPrinterHost) {
-      logger.info('Server is ready, inform front-end')
-      mainWindow.webContents.send('back-end-ready')
-    } else {
-      logger.info('Server is not ready, front-end will be informed later')
-    }
-  })
-  mainWindow.webContents.on('did-fail-load', (event, errorCode, errorDescription, validatedURL, isMainFrame) => {
-    if (errorDescription === 'ERR_INTERNET_DISCONNECTED' || errorDescription === 'ERR_PROXY_CONNECTION_FAILED') {
-      logger.log('Failed to load web contents', errorDescription)
-    } else {
-      logger.error(errorDescription)
-    }
-  })
-  mainWindow.loadURL(INDEX)
-  return mainWindow
-}
-
-function createSplashWindow () {
-  var SPLASH = 'file://' + path.join(__dirname, './static/splash.html')
-  var splash = new BrowserWindow({
-    width: 450,
-    height: 410,
-    center: true,
-    transparent: true,
-    resizable: false,
-    frame: false
-  })
-  splash.loadURL(SPLASH)
-  return splash
-}
-
-contextMenu({
-  showLookUpSelection: false,
-  showCopyImage: true,
-  showSaveImageAs: true,
-  showInspectElement: isDev
-})
-
-function beforeQuit () {
-  if (exiting) return
-  exiting = true
-  // 'close' event will gracefully close databases and wait for pending sync
-  logger.debug('Closing IPC')
-
-  let close = null
-  setTimeout(() => {
-    close = showClosingWindow()
-    try { win.close() } catch (e) {}
-    try { splash.close() } catch (e) {}
-    splash = null
-    win = null
-  }, 300)
-  main.close(() => {
-    if (close) close()
-    app.exit()
-  })
-}
-
-// Only enabled in DEV mode.
-// Create a hidden background window for Mapeo Core
-function createBgWindow (socketName, filename) {
-  if (!socketName) throw new Error('socketName required')
-  logger.debug('loading mapeo core background window')
-  var bgWindow = new BrowserWindow({
-    x: 0,
-    y: 0,
-    width: 700,
-    height: 700,
-    show: argv.debug,
-    webPreferences: {
-      nodeIntegration: true
-    }
-  })
-  bgWindow.loadURL(filename)
-  bgWindow.webContents.on('did-finish-load', () => {
-    if (argv.debug) bgWindow.webContents.openDevTools()
-    if (bgWindow && bgWindow.webContents) {
-      bgWindow.webContents.send('configure', {
-        socketName,
-        userDataPath,
-        isDev
-      })
-    }
-  })
-  bgWindow.on('closed', () => {
-    logger.info('Background window closed')
-    bgWindow = null
-    beforeQuit()
-  })
-
-  return bgWindow
-}
-
-function showClosingWindow () {
-  var CLOSING = 'file://' + path.join(__dirname, './static/closing.html')
-  var closingWin = new BrowserWindow({
-    width: 600,
-    height: 400,
-    frame: false,
-    show: false,
-    alwaysOnTop: false
-  })
-
-  closingWin.loadURL(CLOSING)
-  var closingTimeoutId = setTimeout(() => {
-    closingWin.show()
-  }, 300)
-  return () => {
-    clearTimeout(closingTimeoutId)
-    try { closingWin.close() } catch (e) {}
-    closingWin = null
+    // Ensure we have open ports. Small chance the ports could get taken by
+    // another app before we finish loading, but hopefully unlikely!
+    const [mapeoServerPort, tileServerPort, mapPrinterPort] = await getPorts([
+      argv.port,
+      argv.tileport,
+      argv.mapPrinterPort
+    ])
+    const { headless, debug, datadir } = argv
+    logger.timedPromise(
+      startApp({
+        mapeoServerPort,
+        tileServerPort,
+        mapPrinterPort,
+        headless,
+        debug,
+        datadir
+      }),
+      'Started Mapeo'
+    )
+  } catch (err) {
+    logger.error('Failed to start Mapeo', err)
   }
-}
+})()
diff --git a/package-lock.json b/package-lock.json
index 2a31c385c..c10255c0e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -766,15 +766,6 @@
           "integrity": "sha512-O4KCvQA6lLiMU9l2eawBPMf1xPP8xPfB3iEQw150hOVTqj/rfXz0ThTb4HEzqQfs2Bmo5Ay8BzxfzVtBrr9dVg==",
           "dev": true
         },
-        "@babel/plugin-syntax-flow": {
-          "version": "7.10.4",
-          "resolved": "https://registry.npmjs.org/@babel/plugin-syntax-flow/-/plugin-syntax-flow-7.10.4.tgz",
-          "integrity": "sha512-yxQsX1dJixF4qEEdzVbst3SZQ58Nrooz8NV9Z9GL4byTE25BvJgl5lf0RECUf0fh28rZBb/RYTWn/eeKwCMrZQ==",
-          "dev": true,
-          "requires": {
-            "@babel/helper-plugin-utils": "^7.10.4"
-          }
-        },
         "@babel/types": {
           "version": "7.11.0",
           "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.11.0.tgz",
@@ -1427,6 +1418,21 @@
         "end-of-stream": "^1.0.0",
         "lru-cache": "^2.5.0",
         "mkdirp": "^0.5.0"
+      },
+      "dependencies": {
+        "minimist": {
+          "version": "1.2.5",
+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.5.tgz",
+          "integrity": "sha512-FM9nNUYrRBAELZQT3xeZQ7fmMOBg6nWNmJKTcgsJeaLstP/UODVpGsr5OhXhhXg6f+qtJ8uiZ+PUxkDWcgIXLw=="
+        },
+        "mkdirp": {
+          "version": "0.5.5",
+          "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.5.tgz",
+          "integrity": "sha512-NKmAlESf6jMGym1++R0Ra7wvhV+wFW63FaSOFPwRahvea0gMUcGUhVeAg/0BC0wiv9ih5NYPB1Wn1UEI1/L+xQ==",
+          "requires": {
+            "minimist": "^1.2.5"
+          }
+        }
       }
     },
     "@digidem/extract-react-intl": {
@@ -1473,6 +1479,21 @@
           "integrity": "sha512-YWnfyRwxL/+SsrWYfOpUtz5b3YD+nyfkHvjbcanzk8zgyO4ASD67uVMRt8k5bM4lLMDnXfriRhOpemw+NfT1eA==",
           "dev": true
         },
+        "minimist": {
+          "version": "1.2.5",
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@@ -36238,6 +34946,21 @@
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@@ -36602,6 +35332,12 @@
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@@ -36953,6 +35689,23 @@
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@@ -37152,9 +35905,9 @@
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-      "integrity": "sha1-WvIvGMBSoACkjXuCxenC4v7tpyg="
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-      "dev": true
+      "integrity": "sha1-9F8VDExm7uloGGUFq5P8u4rWv2E="
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@@ -37351,6 +36103,21 @@
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+      "integrity": "sha1-p8IW0mdUUWljeztu3GypEZ4v+T8=",
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@@ -37436,6 +36203,23 @@
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+    "validate-npm-package-name": {
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+      "resolved": "https://registry.npmjs.org/validate-npm-package-name/-/validate-npm-package-name-3.0.0.tgz",
+      "integrity": "sha1-X6kS2B630MdK/BQN5zF/DKffQ34=",
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@@ -37616,6 +36400,21 @@
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+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.5.tgz",
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+        },
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+          "version": "0.5.5",
+          "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.5.tgz",
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+          "dev": true,
+          "requires": {
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+          }
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           "version": "2.0.0",
           "resolved": "https://registry.npmjs.org/strip-bom/-/strip-bom-2.0.0.tgz",
@@ -37869,6 +36668,21 @@
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         },
+        "minimist": {
+          "version": "1.2.5",
+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.5.tgz",
+          "integrity": "sha512-FM9nNUYrRBAELZQT3xeZQ7fmMOBg6nWNmJKTcgsJeaLstP/UODVpGsr5OhXhhXg6f+qtJ8uiZ+PUxkDWcgIXLw==",
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+        },
+        "mkdirp": {
+          "version": "0.5.5",
+          "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.5.tgz",
+          "integrity": "sha512-NKmAlESf6jMGym1++R0Ra7wvhV+wFW63FaSOFPwRahvea0gMUcGUhVeAg/0BC0wiv9ih5NYPB1Wn1UEI1/L+xQ==",
+          "dev": true,
+          "requires": {
+            "minimist": "^1.2.5"
+          }
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         "mute-stream": {
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           "resolved": "https://registry.npmjs.org/mute-stream/-/mute-stream-0.0.7.tgz",
@@ -37976,6 +36790,21 @@
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           "dev": true
         },
+        "minimist": {
+          "version": "1.2.5",
+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.5.tgz",
+          "integrity": "sha512-FM9nNUYrRBAELZQT3xeZQ7fmMOBg6nWNmJKTcgsJeaLstP/UODVpGsr5OhXhhXg6f+qtJ8uiZ+PUxkDWcgIXLw==",
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+        },
+        "mkdirp": {
+          "version": "0.5.5",
+          "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.5.tgz",
+          "integrity": "sha512-NKmAlESf6jMGym1++R0Ra7wvhV+wFW63FaSOFPwRahvea0gMUcGUhVeAg/0BC0wiv9ih5NYPB1Wn1UEI1/L+xQ==",
+          "dev": true,
+          "requires": {
+            "minimist": "^1.2.5"
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           "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
@@ -38034,6 +36863,21 @@
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           "dev": true
         },
+        "minimist": {
+          "version": "1.2.5",
+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.5.tgz",
+          "integrity": "sha512-FM9nNUYrRBAELZQT3xeZQ7fmMOBg6nWNmJKTcgsJeaLstP/UODVpGsr5OhXhhXg6f+qtJ8uiZ+PUxkDWcgIXLw==",
+          "dev": true
+        },
+        "mkdirp": {
+          "version": "0.5.5",
+          "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.5.tgz",
+          "integrity": "sha512-NKmAlESf6jMGym1++R0Ra7wvhV+wFW63FaSOFPwRahvea0gMUcGUhVeAg/0BC0wiv9ih5NYPB1Wn1UEI1/L+xQ==",
+          "dev": true,
+          "requires": {
+            "minimist": "^1.2.5"
+          }
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           "resolved": "https://registry.npmjs.org/ws/-/ws-6.2.1.tgz",
@@ -38280,11 +37124,20 @@
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-          "resolved": "https://registry.npmjs.org/mime/-/mime-2.4.4.tgz",
-          "integrity": "sha512-LRxmNwziLPT828z+4YkNzloCFC2YM4wrB99k+AV5ZbEyfGNWfG8SO1FUXLmLDBSo89NrJZ4DIWeLjy1CHGhMGA==",
+        "minimist": {
+          "version": "1.2.5",
+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.5.tgz",
+          "integrity": "sha512-FM9nNUYrRBAELZQT3xeZQ7fmMOBg6nWNmJKTcgsJeaLstP/UODVpGsr5OhXhhXg6f+qtJ8uiZ+PUxkDWcgIXLw==",
           "dev": true
+        },
+        "mkdirp": {
+          "version": "0.5.5",
+          "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.5.tgz",
+          "integrity": "sha512-NKmAlESf6jMGym1++R0Ra7wvhV+wFW63FaSOFPwRahvea0gMUcGUhVeAg/0BC0wiv9ih5NYPB1Wn1UEI1/L+xQ==",
+          "dev": true,
+          "requires": {
+            "minimist": "^1.2.5"
+          }
         }
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@@ -38443,7 +37296,6 @@
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-      "dev": true,
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       }
@@ -38467,7 +37319,6 @@
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-      "dev": true,
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         "string-width": "^1.0.2 || 2"
       },
@@ -38475,20 +37326,17 @@
         "ansi-regex": {
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           "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-3.0.0.tgz",
-          "integrity": "sha1-7QMXwyIGT3lGbAKWa922Bas32Zg=",
-          "dev": true
+          "integrity": "sha1-7QMXwyIGT3lGbAKWa922Bas32Zg="
         },
         "is-fullwidth-code-point": {
           "version": "2.0.0",
           "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-2.0.0.tgz",
-          "integrity": "sha1-o7MKXE8ZkYMWeqq5O+764937ZU8=",
-          "dev": true
+          "integrity": "sha1-o7MKXE8ZkYMWeqq5O+764937ZU8="
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         "string-width": {
           "version": "2.1.1",
           "resolved": "https://registry.npmjs.org/string-width/-/string-width-2.1.1.tgz",
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-          "dev": true,
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@@ -38498,7 +37346,6 @@
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           "integrity": "sha1-qEeQIusaw2iocTibY1JixQXuNo8=",
-          "dev": true,
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             "ansi-regex": "^3.0.0"
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@@ -38646,7 +37493,6 @@
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       "integrity": "sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=",
-      "dev": true,
       "requires": {
         "string-width": "^1.0.1",
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@@ -38655,14 +37501,12 @@
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           "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
-          "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
-          "dev": true
+          "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8="
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         "is-fullwidth-code-point": {
           "version": "1.0.0",
           "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-1.0.0.tgz",
           "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
-          "dev": true,
           "requires": {
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@@ -38671,7 +37515,6 @@
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           "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
-          "dev": true,
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             "code-point-at": "^1.0.0",
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@@ -38682,7 +37525,6 @@
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-          "dev": true,
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             "ansi-regex": "^2.0.0"
           }
@@ -38701,6 +37543,23 @@
       "dev": true,
       "requires": {
         "mkdirp": "^0.5.1"
+      },
+      "dependencies": {
+        "minimist": {
+          "version": "1.2.5",
+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.5.tgz",
+          "integrity": "sha512-FM9nNUYrRBAELZQT3xeZQ7fmMOBg6nWNmJKTcgsJeaLstP/UODVpGsr5OhXhhXg6f+qtJ8uiZ+PUxkDWcgIXLw==",
+          "dev": true
+        },
+        "mkdirp": {
+          "version": "0.5.5",
+          "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.5.tgz",
+          "integrity": "sha512-NKmAlESf6jMGym1++R0Ra7wvhV+wFW63FaSOFPwRahvea0gMUcGUhVeAg/0BC0wiv9ih5NYPB1Wn1UEI1/L+xQ==",
+          "dev": true,
+          "requires": {
+            "minimist": "^1.2.5"
+          }
+        }
       }
     },
     "write-file-atomic": {
@@ -38770,8 +37629,7 @@
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       "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.1.1.tgz",
-      "integrity": "sha512-a4UGQaWPH59mOXUYnAG2ewncQS4i4F43Tv3JoAM+s2VDAmS9NsK8GpDMLrCHPksFT7h3K6TOoUNn2pb7RoXx4g==",
-      "dev": true
+      "integrity": "sha512-a4UGQaWPH59mOXUYnAG2ewncQS4i4F43Tv3JoAM+s2VDAmS9NsK8GpDMLrCHPksFT7h3K6TOoUNn2pb7RoXx4g=="
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     "yaml": {
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diff --git a/package.json b/package.json
index 856bd6420..55b9ca20b 100644
--- a/package.json
+++ b/package.json
@@ -34,14 +34,17 @@
     "start": "electron . --disable-http-cache",
     "server": "node index.js --headless",
     "dev": "electron . --debug --disable-http-cache",
-    "postinstall": "patch-package",
+    "postinstall": "npm-run-all -p patch-package extract-presets",
+    "patch-package": "patch-package",
+    "extract-presets": "node bin/extract-presets.js",
     "license-check": "license-check",
     "release": "standard-version",
     "release:report": "node bin/report-bugsnag-build.js",
     "release:beta": "standard-version --prerelease beta",
     "storybook": "start-storybook -p 6006 --ci",
     "build-storybook": "build-storybook",
-    "extract-messages": "extract-messages --locales=en --output messages/renderer --descriptions 'src/**/*.js'"
+    "extract-messages": "extract-messages --locales=en --output messages/renderer --descriptions 'src/**/*.js'",
+    "type": "tsc"
   },
   "license": "GPL-3.0",
   "repository": {
@@ -93,7 +96,6 @@
     "bugsnag-build-reporter": "^1.0.3",
     "bugsnag-sourcemaps": "^1.3.0",
     "capture-exit": "^2.0.0",
-    "chela": "^0.1.0",
     "clone-deep": "^4.0.1",
     "clsx": "^1.0.4",
     "compare-versions": "^3.6.0",
@@ -102,7 +104,7 @@
     "d3-dsv": "^1.1.1",
     "date-fns": "^2.1.0",
     "domain-ping": "^0.1.10",
-    "ecstatic": "^2.2.1",
+    "ecstatic": "^4.1.4",
     "electron-context-menu": "^0.15.0",
     "electron-debug": "^1.5.0",
     "electron-is-dev": "^1.1.0",
@@ -114,6 +116,7 @@
     "fs-cache-middleware": "^1.0.0",
     "fs-extra": "^9.0.1",
     "fs-write-stream-atomic": "^1.0.10",
+    "get-port": "^5.1.1",
     "get-scrollbar-width": "^1.0.4",
     "hidden-mapbox": "^1.0.1",
     "html-react-parser": "^0.9.1",
@@ -126,13 +129,13 @@
     "lodash": "^4.17.4",
     "mapbox-gl": "^1.4.1",
     "mapbox-map-image-stream": "^2.1.1",
+    "mapeo-default-settings": "^3.4.0",
     "mapeo-entity-filter": "^2.0.0",
     "mapeo-schema": "^2.0.2",
     "mapeo-server": "^17.0.6",
-    "mapeo-styles": "^3.0.2",
     "mime": "^2.4.6",
     "minimist": "^1.2.0",
-    "mkdirp": "^0.5.1",
+    "mkdirp": "^1.0.4",
     "network-speed": "^2.0.7",
     "node-fetch": "^2.6.0",
     "node-wifi": "^2.0.14",
@@ -140,6 +143,7 @@
     "once": "^1.4.0",
     "osm-p2p": "^5.1.0",
     "osm-p2p-server": "v6.0.0",
+    "p-defer": "^3.0.0",
     "p-queue": "^6.6.2",
     "p-timeout": "^3.2.0",
     "pump": "^1.0.3",
@@ -161,6 +165,7 @@
     "run-parallel-limit": "^1.0.5",
     "run-series": "^1.1.4",
     "safe-fs-blob-store": "^1.0.0",
+    "sanitize-filename": "^1.6.3",
     "semver": "^7.3.2",
     "signal-exit": "^3.0.3",
     "styled-components": "^3.4.4",
@@ -168,6 +173,7 @@
     "tar-fs": "^1.16.0",
     "terminate": "^2.1.2",
     "through2": "^2.0.5",
+    "tiny-typed-emitter": "^2.0.3",
     "utm": "^1.1.1",
     "winston": "^3.2.1",
     "winston-daily-rotate-file": "^4.4.2",
@@ -194,6 +200,11 @@
     "@storybook/addon-links": "^5.2.1",
     "@storybook/addons": "^5.2.1",
     "@storybook/react": "^5.2.1",
+    "@types/electron-debug": "^2.1.0",
+    "@types/minimist": "^1.2.1",
+    "@types/mkdirp": "^1.0.1",
+    "@types/node": "^12.20.4",
+    "@types/webpack-env": "^1.16.0",
     "@vercel/nft": "^0.9.3",
     "babel-eslint": "^10.1.0",
     "babel-loader": "^8.0.6",
@@ -204,7 +215,7 @@
     "css-loader": "^3.2.0",
     "debug": "^4.1.1",
     "dependency-check": "^3.4.1",
-    "electron": "^9.1.2",
+    "electron": "^9.4.4",
     "electron-builder": "^22.2.0",
     "electron-devtools-installer": "^3.1.1",
     "electron-notarize": "^1.0.0",
@@ -245,6 +256,7 @@
     "style-loader": "^1.0.0",
     "tape": "^4.9.1",
     "terser-webpack-plugin": "^4.1.0",
+    "typescript": "^4.2.2",
     "url-loader": "^4.1.1",
     "webpack": "^4.40.2",
     "webpack-bundle-analyzer": "^3.8.0",
diff --git a/src/background/map-printer/index.html b/src/background/index.html
similarity index 100%
rename from src/background/map-printer/index.html
rename to src/background/index.html
diff --git a/src/background/index.js b/src/background/index.js
index 6c8328735..4d57dc149 100644
--- a/src/background/index.js
+++ b/src/background/index.js
@@ -1,43 +1,166 @@
-const rabbit = require('electron-rabbit')
-const NodePIDManager = require('../pid-manager')
-
-function startNodeIPC (serverHandlers) {
-  if (process.argv[2] === '--subprocess') {
-    const logger = require('../logger')
-    const socketName = process.argv[3]
-    const userDataPath = process.argv[4]
-    if (!logger.configured) {
-      logger.configure({
-        label: 'background',
-        userDataPath
-      })
+// @ts-check
+
+const { ipcRenderer, remote } = require('electron')
+const path = require('path')
+
+const logger = require('../logger')
+
+/** @typedef {import('../utils/types').BackgroundProcess} BackgroundProcess */
+/** @typedef {import('../utils/types').IpcResponse} IpcResponse */
+
+const [modulePath, argsJSON] = process.argv.slice(-2)
+const userDataPath = remote.app.getPath('userData')
+const label = path.basename(modulePath)
+
+/** @type {'starting' | 'ready' | 'closing' | 'closed'} */
+let status = 'starting'
+
+logger.configure({ userDataPath, label })
+//
+;(async function initialize () {
+  try {
+    const args = argsJSON && JSON.parse(argsJSON)
+
+    const start = Date.now()
+    /** @type {unknown} */
+    const init = require(modulePath)
+    logger.debug(`Parsed module Javascript in ${Date.now() - start}ms`)
+
+    if (typeof init !== 'function') {
+      throw new Error('Invalid Module in worker, must export a function')
     }
 
-    var manager = new NodePIDManager(userDataPath)
-    manager.pid((err) => {
-      if (err) logger.error('Error writing PID file', err)
-      logger.debug('PID file written successfully.')
-    })
+    /** @type {unknown} */
+    const bp = init(args)
 
-    rabbit.init(socketName, serverHandlers)
-  } else {
-    const electron = require('electron')
-    const logger = require('../logger')
-
-    electron.ipcRenderer.on('configure', (event, {
-      socketName, isDev, userDataPath
-    }) => {
-      logger.info('configured', socketName)
-      if (!logger.configured) {
-        logger.configure({
-          label: 'background',
-          userDataPath,
-          isDev
+    if (!isValidBackgroundProcess(bp)) {
+      throw new Error(
+        'Invalid background process module. A backbground process must have a handlers object, with optional start and close functions'
+      )
+    }
+
+    window.onbeforeunload = event => {
+      logger.debug('Window unload. Current status: ' + status)
+      // not using async function for event handler, since this returns a
+      // Promise, which _might_ cancel the window close, since spec says that
+      // returning anything other than undefined from the event handler cancels
+      // close
+      if (!bp.close || status === 'closed') return
+      event.returnValue = false // cancel window close
+      if (status === 'closing') return // don't call close twice
+      status = 'closing'
+      // close window after worker has closed
+      bp.close()
+        .catch(err => {
+          logger.error('Error trying to close', err)
+        })
+        .finally(() => {
+          status = 'closed'
+          window.onbeforeunload = undefined
+          window.close()
         })
+    }
+
+    ipcRenderer.on('new-client', event => {
+      logger.debug('New client received')
+      const [port] = event.ports
+      port.onmessage = async event => {
+        handleMessage(bp.handlers, event.data, port)
+      }
+      port.onmessageerror = event => {
+        logger.error(event.data)
       }
-      rabbit.init(socketName, serverHandlers)
     })
+
+    let startupResult
+    if (bp.start) {
+      logger.debug('Calling start()')
+      startupResult = await bp.start()
+    }
+    logger.debug('Started; informing main process')
+    ipcRenderer.send('startup', null, startupResult)
+  } catch (error) {
+    logger.error('error', error)
+    ipcRenderer.send('startup', error)
   }
+})()
+
+/** @typedef {{ id: number, name: string, args: any }} Message */
+
+/**
+ * @param {BackgroundProcess['handlers']} handlers
+ * @param {unknown} message
+ * @param {MessagePort} port
+ */
+async function handleMessage (handlers, message, port) {
+  if (!isValidMessage(message)) {
+    // Cannot return anything here
+    logger.error('Received invalid IPC message')
+    return
+  }
+  logger.debug('IPC message', message)
+
+  const { id, name, args } = message
+
+  try {
+    const handler = handlers[name]
+
+    if (typeof handler !== 'function') {
+      throw new Error('Unknown method: ' + name)
+    }
+
+    const result = await Promise.resolve(handler(args))
+
+    port.postMessage(/** @type {IpcResponse} */ ({ type: 'reply', id, result }))
+  } catch (error) {
+    logger.error('IPC error: ' + error.message)
+    port.postMessage(
+      /** @type {IpcResponse} */ ({ type: 'error', id, result: error.message })
+    )
+  }
+}
+
+/**
+ * Validate worker
+ *
+ * @param {unknown} bp
+ * @returns {bp is BackgroundProcess}
+ */
+function isValidBackgroundProcess (bp) {
+  if (!isObject(bp)) return false
+  if (bp.start && typeof bp.start !== 'function') {
+    return false
+  }
+  if (bp.close && typeof bp.close !== 'function') {
+    return false
+  }
+  if (typeof bp.handlers !== 'object' && bp.handlers !== null) {
+    return false
+  }
+  return true
 }
 
-module.exports = startNodeIPC
+/**
+ * Validate an IPC message request
+ *
+ * @param {unknown} message
+ * @returns {message is import('../utils/types').IpcRequest}
+ */
+function isValidMessage (message) {
+  if (!isObject(message)) return false
+  if (typeof message.id !== 'number') {
+    return false
+  }
+  if (typeof message.name !== 'string') {
+    return false
+  }
+  return true
+}
+
+/**
+ * @param {unknown} something
+ * @returns {something is { [prop: string]: unknown }}
+ */
+function isObject (something) {
+  return typeof something === 'object' && something !== null
+}
diff --git a/src/background/map-printer/index.js b/src/background/map-printer/index.js
index c58c59d96..d2beff781 100644
--- a/src/background/map-printer/index.js
+++ b/src/background/map-printer/index.js
@@ -1,34 +1,26 @@
+// @ts-check
 const http = require('http')
 const mapRouter = require('./server')
-const background = require('..')
+const { listen, close } = require('../../utils/async-server')
 const logger = require('../../logger')
 
-var handlers = {}
-var server = null
-
-handlers.close = async (opts) => {
-  return new Promise((resolve, reject) => {
-    if (!server) return resolve()
-    server.close((err) => {
-      if (err) {
-        logger.error('Could not close map printer', err)
-        return reject(err)
-      }
-      resolve()
-    })
+/**
+ * @param {import('../../utils/types').MapPrinterOptions} options
+ * @returns {import('../../utils/types').BackgroundProcess}
+ */
+module.exports = function init ({ mapPrinterPort }) {
+  const server = http.createServer((req, res) => {
+    mapRouter.handle(req, res)
   })
-}
 
-handlers.listen = async (mapPrinterPort) => {
-  return new Promise((resolve, reject) => {
-    server = http.createServer((req, res) => {
-      mapRouter.handle(req, res)
-    })
-    server.listen(mapPrinterPort, (err) => {
-      if (err) reject(err)
-      else resolve()
-    })
-  })
+  return {
+    start: async () => {
+      const url = await listen(server, mapPrinterPort, '127.0.0.1')
+      logger.info('Map printer listening on: ' + url)
+    },
+    close: async () => {
+      return close(server)
+    },
+    handlers: {}
+  }
 }
-
-background(handlers)
diff --git a/src/background/mapeo-core/index.html b/src/background/mapeo-core/index.html
deleted file mode 100644
index b642ae502..000000000
--- a/src/background/mapeo-core/index.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<html>
-  <head>
-  </head>
-  <body>
-  <script>
-      require('./index.js')
-  </script>
-  </body>
-</html>
diff --git a/src/background/mapeo-core/index.js b/src/background/mapeo-core/index.js
index 8a501ca12..35ea4b603 100644
--- a/src/background/mapeo-core/index.js
+++ b/src/background/mapeo-core/index.js
@@ -1,214 +1,226 @@
-const rabbit = require('electron-rabbit')
+// @ts-check
 const os = require('os')
 const http = require('http')
+const promiseDefer = require('p-defer')
 
-const background = require('..')
 const logger = require('../../logger')
 
 const Mapeo = require('./mapeo')
 const createTileServer = require('./tile-server')
 const createRouter = require('./server')
+const { listen, close } = require('../../utils/async-server')
+
+const channel = new BroadcastChannel('mapeo-core')
+
+/**
+ * Broadcast a message to all listeners
+ *
+ * @param {string} name
+ * @param {*} args
+ */
+function broadcastMessage (name, args) {
+  logger.debug('Broadcast message', { name, args })
+  channel.postMessage({ name, args })
+}
 
-class MapeoManager {
-  constructor ({ datadir, userDataPath, port, tileport }) {
-    this.mapeo = null
-    this.tileServer = null
-    this.opts = { datadir, userDataPath, port, tileport }
-    this.router = null
-  }
-
-  listen (cb) {
-    let pending = 2
-
-    this._createMapeo(() => {
-      if (!this.server) {
-        this.server = http.createServer((req, res) => {
-          logger.debug('server request', req.url)
-          this.router(req, res)
-        })
-      }
-      this.server.listen(this.opts.port, '127.0.0.1', () => {
-        logger.info('osm-p2p-server listening on :', this.server.address().port)
-        if (--pending === 0) cb()
-      })
-    })
+/** @typedef {import('../../utils/types').MapeoCoreOptions} Options */
 
-    this.tileServer = createTileServer(this.opts.userDataPath)
-    this.tileServer.listen(this.opts.tileport, () => {
-      logger.info('Tile server listening on :', this.tileServer.address().port)
-      if (--pending === 0) cb()
-    })
+class MapeoManager {
+  /**
+   * Creates an instance of MapeoManager.
+   * @param {Options} options
+   */
+  constructor ({ datadir, userDataPath, mapeoServerPort, tileServerPort }) {
+    const deferred = promiseDefer()
+    this.deferredMapeo = deferred.promise
+    /** @type {promiseDefer.DeferredPromise<any>['resolve'] | void} */
+    this._resolveMapeo = deferred.resolve
+    this.opts = { datadir, userDataPath, mapeoServerPort, tileServerPort }
   }
 
-  _createMapeo (cb) {
-    var ipcSend = rabbit.send
+  async start () {
     logger.info('Creating a new mapeo', this.opts)
-    this.mapeo = new Mapeo({
+
+    const mapeo = new Mapeo({
       datadir: this.opts.datadir,
       userDataPath: this.opts.userDataPath,
-      ipcSend
+      ipcSend: broadcastMessage
     })
 
-    var { router, core } = createRouter(this.mapeo.osm, this.mapeo.media, {
+    var { router, core } = createRouter(mapeo.osm, mapeo.media, {
       staticRoot: this.opts.userDataPath,
-      ipcSend
+      ipcSend: broadcastMessage
     })
 
-    this.router = router
+    // Sets up listening for sync
+    await mapeo.listen(core)
 
-    this.mapeo.listen(core, () => {
-      // hostname often includes a TLD, which we remove
-      const computerName = (os.hostname() || 'Mapeo Desktop').split('.')[0]
-      this.mapeo.core.sync.setName(computerName)
-      cb()
-    })
-  }
+    if (!this._resolveMapeo) throw new Error('Unexpected error')
+    this._resolveMapeo(mapeo)
+    this._resolveMapeo = undefined // Let's be extra-careful not to resolve twice
+
+    // hostname often includes a TLD, which we remove
+    const computerName = (os.hostname() || 'Mapeo Desktop').split('.')[0]
+    mapeo.core.sync.setName(computerName)
 
-  reloadConfig (cb) {
-    logger.debug('closing old mapeo')
-    this.mapeo.close(() => {
-      this.mapeo = null
-      logger.debug('opening new one')
-      this._createMapeo(cb)
+    this.mapeoServer = http.createServer((req, res) => {
+      logger.debug('server request', req.url)
+      router(req, res)
     })
+    const mapeoServerUrl = await listen(
+      this.mapeoServer,
+      this.opts.mapeoServerPort,
+      '127.0.0.1'
+    )
+    logger.info('osm-p2p-server listening on:', mapeoServerUrl)
+
+    this.tileServer = createTileServer(this.opts.userDataPath)
+    const tileServerUrl = await listen(
+      this.tileServer,
+      this.opts.tileServerPort,
+      '127.0.0.1'
+    )
+    logger.info('Tile server listening on:', tileServerUrl)
   }
 
-  close (cb) {
-    if (!this.mapeo) return cb()
-    try {
-      this.mapeo.close((err) => {
-        if (err) return cb(err)
-        this.mapeo = null
-        this.server.close((err) => {
-          if (err) return cb(err)
-          this.server = null
-          this.tileServer.close((err) => {
-            if (err) return cb(err)
-            this.tileServer = null
-            cb()
-          })
-        })
-      })
-    } catch (err) {
-      return cb(err)
-    }
+  async reloadConfig () {
+    logger.debug('Closing old mapeo')
+    await this.close()
+    logger.debug('old mapeo closed')
+    await this.start()
+    logger.info('Configuration reloaded')
   }
-}
 
-var handlers = {}
-var manager = null
-
-handlers['reload-config'] = async () => {
-  return new Promise((resolve, reject) => {
-    manager.reloadConfig((err) => {
-      if (err) {
-        logger.error('Reload config', err)
-        return reject(err)
-      }
-      logger.info('Configuration reloaded')
-      resolve()
-    })
-  })
-}
+  async close () {
+    const mapeo = await this.deferredMapeo
 
-handlers.close = async () => {
-  return new Promise((resolve, reject) => {
-    if (!manager) return resolve()
-    manager.close((err) => {
-      logger.info('CLOSED')
-      if (err) {
-        logger.error('Could not close', err)
-        return reject(err)
-      }
-      resolve()
-    })
-  })
-}
+    // Setup a new deferred promise that will handle any requests made whilst
+    // current mapeo is closing
+    const deferred = promiseDefer()
+    this.deferredMapeo = deferred.promise
+    this._resolveMapeo = deferred.resolve
+
+    await mapeo.close()
+    logger.debug('Closed Mapeo Core')
 
-handlers.listen = async (opts) => {
-  if (!manager) manager = new MapeoManager(opts)
-  return new Promise((resolve, reject) => {
-    manager.listen(resolve)
-  })
+    if (this.mapeoServer && this.mapeoServer.listening) {
+      await close(this.mapeoServer)
+      logger.debug('Closed Mapeo Server')
+    }
+
+    if (this.tileServer && this.tileServer.listening) {
+      await close(this.tileServer)
+      logger.debug('Closed Tile Server')
+    }
+  }
 }
 
-handlers['import-tiles'] = async (filename) => {
-  return new Promise((resolve, reject) => {
-    manager.mapeo.tiles.go(filename, (err) => {
-      if (err) {
-        logger.error(`mapeo.tiles.go(${filename})`, err)
-        return reject(err)
-      } else resolve()
+/**
+ * @param {Options} opts
+ * @returns {import('../../utils/types').BackgroundProcess}
+ */
+module.exports = function init (opts) {
+  /** @type {import('../../utils/types').BackgroundProcess['handlers']} */
+  var handlers = {}
+  var manager = new MapeoManager(opts)
+
+  handlers['reload-config'] = async () => manager.reloadConfig()
+
+  /** @type {(filename: string) => Promise<void>} */
+  handlers['import-tiles'] = async filename => {
+    const mapeo = await manager.deferredMapeo
+    return new Promise((resolve, reject) => {
+      // @ts-ignore
+      mapeo.tiles.go(filename, err => {
+        if (err) {
+          logger.error(`mapeo.tiles.go(${filename})`, err)
+          return reject(err)
+        } else resolve()
+      })
     })
-  })
-}
+  }
 
-handlers['encryption-key'] = async () => {
-  return new Promise((resolve, reject) => {
-    resolve(manager.mapeo.encryptionKey)
-  })
-}
+  handlers['encryption-key'] = async () => {
+    const mapeo = await manager.deferredMapeo
+    return mapeo.encryptionKey
+  }
 
-handlers['import-data'] = async (filename) => {
-  manager.mapeo.core.importer.importFromFile(filename)
-}
+  /** @type {(filename: string) => Promise<void>} */
+  handlers['import-data'] = async filename => {
+    const mapeo = await manager.deferredMapeo
+    mapeo.core.importer.importFromFile(filename)
+  }
 
-handlers['sync-start'] = async (target) => {
-  manager.mapeo.syncStart(target)
-}
+  /** @type {(target: any) => Promise<void>} */
+  handlers['sync-start'] = async target => {
+    const mapeo = await manager.deferredMapeo
+    mapeo.syncStart(target)
+  }
 
-handlers['sync-join'] = async () => {
-  manager.mapeo.syncJoin()
-}
+  handlers['sync-join'] = async () => {
+    const mapeo = await manager.deferredMapeo
+    mapeo.syncJoin()
+  }
 
-handlers['sync-leave'] = async () => {
-  manager.mapeo.syncLeave()
-}
+  handlers['sync-leave'] = async () => {
+    const mapeo = await manager.deferredMapeo
+    mapeo.syncLeave()
+  }
 
-handlers['export-data'] = async (args) => {
-  logger.info('Exporting data', args)
-  return new Promise((resolve, reject) => {
-    manager.mapeo.exportData(args, (err) => {
-      if (err) {
-        logger.error(`mapeo.exportData(${args})`, err)
-        return reject(err)
-      }
-      resolve()
+  /** @type {(args: any) => Promise<void>} */
+  handlers['export-data'] = async args => {
+    logger.info('Exporting data', args)
+    const mapeo = await manager.deferredMapeo
+    return new Promise((resolve, reject) => {
+      // @ts-ignore
+      mapeo.exportData(args, err => {
+        if (err) {
+          logger.error(`mapeo.exportData(${args})`, err)
+          return reject(err)
+        }
+        resolve()
+      })
     })
-  })
-}
+  }
 
-handlers['zoom-to-data-get-centroid'] = async (type) => {
-  return new Promise((resolve, reject) => {
-    manager.mapeo.getDatasetCentroid(type, (err, loc) => {
-      if (err) {
-        logger.error(`mapeo.getDatasetCentroid(${type})`, err)
-        return reject(err)
-      }
-      resolve(loc)
+  handlers['zoom-to-data-get-centroid'] = async type => {
+    const mapeo = await manager.deferredMapeo
+    return new Promise((resolve, reject) => {
+      // @ts-ignore
+      mapeo.getDatasetCentroid(type, (err, loc) => {
+        if (err) {
+          logger.error(`mapeo.getDatasetCentroid(${type})`, err)
+          return reject(err)
+        }
+        resolve(loc)
+      })
     })
-  })
-}
+  }
 
-handlers['get-replicating-peers'] = async () => {
-  return new Promise((resolve, reject) => {
-    if (!manager.mapeo) return reject(new Error('Start mapeo before getting active peers!'))
-    resolve(manager.mapeo.getReplicatingPeers().length)
-  })
-}
+  handlers['get-replicating-peers'] = async () => {
+    const mapeo = await manager.deferredMapeo
+    return mapeo.getReplicatingPeers().length
+  }
 
-handlers['get-database-status'] = async () => {
-  return new Promise((resolve, reject) => {
-    if (!manager.mapeo) return reject(new Error('Start mapeo before getting database status!'))
-    manager.mapeo.core.getFeedStatus((err, stats) => {
-      if (err) return reject(err)
-      resolve(stats)
+  handlers['get-database-status'] = async () => {
+    const mapeo = await manager.deferredMapeo
+    return new Promise((resolve, reject) => {
+      // @ts-ignore
+      mapeo.core.getFeedStatus((err, stats) => {
+        if (err) return reject(err)
+        resolve(stats)
+      })
     })
-  })
-}
+  }
 
-handlers.debugging = async (bool) => {
-  logger.debugging(bool)
-}
+  /** @type {(bool: boolean) => Promise<void>} */
+  handlers.debugging = async bool => {
+    logger.debugging(bool)
+  }
 
-background(handlers)
+  return {
+    start: async () => manager.start(),
+    close: async () => manager.close(),
+    handlers
+  }
+}
diff --git a/src/background/mapeo-core/mapeo.js b/src/background/mapeo-core/mapeo.js
index 471b71f85..897a7daf9 100644
--- a/src/background/mapeo-core/mapeo.js
+++ b/src/background/mapeo-core/mapeo.js
@@ -1,12 +1,12 @@
 const path = require('path')
 const throttle = require('lodash/throttle')
 const MediaStore = require('safe-fs-blob-store')
-const Settings = require('@mapeo/settings')
 const sublevel = require('subleveldown')
 const level = require('level')
 const createOsmDbOrig = require('kappa-osm')
 const kappa = require('kappa-core')
 const raf = require('random-access-file')
+const { ipcRenderer } = require('electron')
 
 const logger = require('../../logger')
 const TileImporter = require('./tile-importer')
@@ -18,9 +18,12 @@ const installStatsIndex = require('./osm-stats')
 class MapeoRPC {
   constructor ({ datadir, userDataPath, ipcSend }) {
     this.storages = []
-    this.config = new Settings(userDataPath)
-    this.encryptionKey = this.config.getEncryptionKey()
-    logger.info('got encryptionKey', this.encryptionKey && this.encryptionKey.substr(0, 4))
+    const metadata = ipcRenderer.sendSync('get-user-data', 'metadata')
+    this.encryptionKey = metadata && metadata.projectKey
+    logger.info(
+      'got encryptionKey',
+      this.encryptionKey && this.encryptionKey.substr(0, 4)
+    )
     this.tiles = TileImporter(userDataPath)
 
     var feedsDir = path.join(datadir, 'storage')
@@ -67,7 +70,7 @@ class MapeoRPC {
     this._onNewPeer = this._onNewPeer.bind(this)
   }
 
-  listen (core, cb) {
+  async listen (core) {
     this.core = core
     this.core.sync.on('peer', this._onNewPeer)
     this.core.sync.on('down', this._throttledSendPeerUpdate)
@@ -79,29 +82,28 @@ class MapeoRPC {
       this.ipcSend('error', err.toString())
     })
 
-    importer.on('complete', (filename) => {
+    importer.on('complete', filename => {
       this.ipcSend('import-complete', path.basename(filename))
     })
 
     // TODO(KM): this progress code isn't being caught & rendered by frontend
     importer.on('progress', (filename, index, total) => {
-      this.ipcSend(
-        'import-progress',
-        path.basename(filename),
-        index,
-        total
-      )
+      this.ipcSend('import-progress', path.basename(filename), index, total)
     })
 
-    this.core.on('error', (e) => this._handleError('mapeo core', e))
-    this.core.sync.listen((err) => {
-      cb(err)
+    this.core.on('error', e => this._handleError('mapeo core', e))
+
+    return new Promise((resolve, reject) => {
+      this.core.sync.listen(err => {
+        if (err) reject(err)
+        else resolve()
+      })
     })
   }
 
   _syncWatch (sync) {
     const startTime = Date.now()
-    var onend = (err) => {
+    var onend = err => {
       if (err) {
         this._handleError('sync error', err)
       } else {
@@ -123,7 +125,10 @@ class MapeoRPC {
   _onNewPeer (peer) {
     this._throttledSendPeerUpdate(peer)
     if (!peer.sync) {
-      return this._handleError('sync', new Error('Could not monitor peer, missing sync property'))
+      return this._handleError(
+        'sync',
+        new Error('Could not monitor peer, missing sync property')
+      )
     }
     peer.sync.once('sync-start', () => {
       this._syncWatch(peer.sync)
@@ -165,7 +170,7 @@ class MapeoRPC {
   }
 
   exportData ({ filename, format, id }, cb) {
-    const presets = this.config.getSettings('presets') || {}
+    const presets = ipcRenderer.sendSync('get-user-data', 'presets') || {}
     logger.info('Exporting', filename, format)
     this.core.exportData(filename, { format, presets }, cb)
   }
@@ -176,8 +181,8 @@ class MapeoRPC {
       .filter(
         peer =>
           peer.state &&
-        (peer.state.topic === 'replication-started' ||
-          peer.state.topic === 'replication-progress')
+          (peer.state.topic === 'replication-started' ||
+            peer.state.topic === 'replication-progress')
       )
   }
 
@@ -210,31 +215,36 @@ class MapeoRPC {
     })
   }
 
-  close (cb) {
+  async close () {
     // Prevents close from being called twice in a row
-    if (this.closing || !this.core) return process.nextTick(cb)
-    this.closing = true
-    let pending = this.storages.length + 2
-
-    this.core.sync.removeListener('peer', this._onNewPeer)
-    this.core.sync.removeListener('down', this._throttledSendPeerUpdate)
-    this.onReplicationComplete(() => {
-      this.core.close(() =>
-        this.osm.core.pause(() => {
-          this.osm.core._logs.close(done)
-          this.storages.forEach(storage => {
-            storage.close(done)
+    // TODO: BUG This means this will resolve before Mapeo has actually closed
+    if (this.closing || !this.core) return
+
+    return new Promise((resolve, reject) => {
+      this.closing = true
+      let pending = this.storages.length + 2
+
+      this.core.sync.removeListener('peer', this._onNewPeer)
+      this.core.sync.removeListener('down', this._throttledSendPeerUpdate)
+      this.onReplicationComplete(() => {
+        this.core.close(() =>
+          this.osm.core.pause(() => {
+            this.osm.core._logs.close(done)
+            this.storages.forEach(storage => {
+              storage.close(done)
+            })
+            this.indexDb.close(done)
           })
-          this.indexDb.close(done)
-        })
-      )
-    })
+        )
+      })
 
-    var done = () => {
-      if (--pending) return
-      this.closing = false
-      cb()
-    }
+      var done = () => {
+        // TODO: Handle errors when closing
+        if (--pending) return
+        this.closing = false
+        resolve()
+      }
+    })
   }
 
   _handleError (context, err) {
@@ -246,7 +256,7 @@ class MapeoRPC {
   // Send message to frontend whenever there is an update to the peer list
   _sendPeerUpdate (peer) {
     const peers = this.core.sync.peers().map(peer => {
-      const { connection, ...rest } = peer
+      const { connection, handshake, sync, ...rest } = peer
       return rest
     })
     logger.debug('sending peer update', peers)
diff --git a/src/background/mapeo-core/server.js b/src/background/mapeo-core/server.js
index 764227be6..67b21d78e 100644
--- a/src/background/mapeo-core/server.js
+++ b/src/background/mapeo-core/server.js
@@ -2,6 +2,7 @@ var path = require('path')
 var createMapeoRouter = require('mapeo-server')
 var ecstatic = require('ecstatic')
 var createOsmRouter = require('osm-p2p-server')
+var { DEFAULT_CONFIG_DIR } = require('../../../config')
 var logger = console
 
 module.exports = function (osm, media, { ipcSend, staticRoot }) {
@@ -10,7 +11,7 @@ module.exports = function (osm, media, { ipcSend, staticRoot }) {
     staticRoot: staticRoot,
     writeFormat: 'osm-p2p-syncfile',
     deviceType: 'desktop',
-    fallbackPresetsDir: path.join(staticRoot, 'DEFAULT_SETTINGS', 'presets')
+    fallbackPresetsDir: DEFAULT_CONFIG_DIR
   })
 
   var staticHandler = ecstatic({
diff --git a/src/background/mapeo-core/tile-importer.js b/src/background/mapeo-core/tile-importer.js
index e77a80d52..a36b000d7 100644
--- a/src/background/mapeo-core/tile-importer.js
+++ b/src/background/mapeo-core/tile-importer.js
@@ -82,32 +82,35 @@ TileImporter.prototype._extractTar = function (tilesPath, destPath, cb) {
 TileImporter.prototype.moveTiles = function (tilesPath, tilesDest, cb) {
   fs.stat(tilesPath, (err, stat) => {
     if (err) return cb(err)
-    mkdirp(tilesDest, err => {
-      if (err) return cb(err)
-      // TODO: deprecate asar support
-      if (path.extname(tilesPath) === '.asar') {
-        var filename = path.basename(tilesPath)
-        // because electron treats asar as a folder, not a file.
-        process.noAsar = true
-        return fs.copyFile(tilesPath, path.join(tilesDest, filename), err => {
-          process.noAsar = false
-          return cb(err)
-        })
-      }
-      if (stat.isDirectory()) {
-        var styleId = path.basename(tilesDest)
-        return this._createAsar(
-          tilesPath,
-          path.join(tilesDest, styleId + '.asar'),
-          cb
-        )
-      }
-      if (path.extname(tilesPath) === '.tar') {
-        this._extractTar(tilesPath, tilesDest, cb)
-      } else {
-        return cb(new Error('Must be a .tar, .asar, or directory with tiles.'))
-      }
-    })
+    mkdirp(tilesDest)
+      .then(() => {
+        // TODO: deprecate asar support
+        if (path.extname(tilesPath) === '.asar') {
+          var filename = path.basename(tilesPath)
+          // because electron treats asar as a folder, not a file.
+          process.noAsar = true
+          return fs.copyFile(tilesPath, path.join(tilesDest, filename), err => {
+            process.noAsar = false
+            return cb(err)
+          })
+        }
+        if (stat.isDirectory()) {
+          var styleId = path.basename(tilesDest)
+          return this._createAsar(
+            tilesPath,
+            path.join(tilesDest, styleId + '.asar'),
+            cb
+          )
+        }
+        if (path.extname(tilesPath) === '.tar') {
+          this._extractTar(tilesPath, tilesDest, cb)
+        } else {
+          return cb(
+            new Error('Must be a .tar, .asar, or directory with tiles.')
+          )
+        }
+      })
+      .catch(cb)
   })
 }
 
@@ -116,7 +119,13 @@ TileImporter.prototype._createAsar = function (tilesPath, destFile, cb) {
   try {
     asar.createPackage(tilesPath, destFile).then(cb)
   } catch (err) {
-    logger.error('ERROR(tile-importer): Got error when creating asar' + tilesPath + ' ' + destFile, err)
+    logger.error(
+      'ERROR(tile-importer): Got error when creating asar' +
+        tilesPath +
+        ' ' +
+        destFile,
+      err
+    )
     return cb(err)
   }
 }
diff --git a/src/client-ipc.js b/src/client-ipc.js
new file mode 100644
index 000000000..6b4d4d9d5
--- /dev/null
+++ b/src/client-ipc.js
@@ -0,0 +1,118 @@
+// @ts-check
+
+const { EventEmitter } = require('events')
+const logger = require('./logger')
+
+const channel =
+  process.type === 'renderer' ? new BroadcastChannel('mapeo-core') : undefined
+
+/** @typedef {(...args: unknown[]) => any} Callback */
+
+class IPC extends EventEmitter {
+  /** @param {{ port: MessagePort | import('electron').MessagePortMain }} opts */
+  constructor ({ port }) {
+    super()
+    /** @type {Map<number, { cb: Callback}>} */
+    this.replyHandlers = new Map()
+    this.port = port
+    this.id = 0
+    this._connect()
+  }
+
+  /**
+   * Call a handler `name` on the server
+   *
+   * @param {string} name Name of socket to send the message
+   * @param {any} args Arguments to pass to the handler
+   * @param {Callback} cb Callback with reply
+   * @memberof IPC
+   */
+  send (name, args, cb) {
+    if (!cb && typeof args === 'function') {
+      cb = args
+      args = {}
+    }
+    const id = this.id++
+    this.replyHandlers.set(id, { cb })
+    this.port.postMessage({ id, name, args })
+    logger.debug('Send IPC message', { id, name, args })
+  }
+
+  _connect () {
+    /** @type {(event: MessageEvent | import('electron').MessageEvent) => void} */
+    const handleMessage = event => {
+      const msg = event.data
+
+      if (!isValidIpcMessage(msg)) {
+        logger.error('Invalid IPC message', msg)
+        return
+      }
+      logger.debug('Received IPC message', msg)
+
+      const { id, result } = msg
+      const handler = this.replyHandlers.get(id)
+      if (!handler) return
+      this.replyHandlers.delete(id)
+      if (!handler.cb) return
+      if (msg.type === 'error') {
+        handler.cb(result)
+      } else {
+        handler.cb(null, result)
+      }
+    }
+
+    // Slight difference in API when this is running in render process vs main process
+    if ('onmessage' in this.port) {
+      this.port.onmessage = handleMessage
+      this.port.onmessageerror = event => {
+        logger.error(event.data)
+      }
+    } else {
+      this.port.on('message', handleMessage)
+      this.port.start()
+    }
+
+    if (channel) {
+      channel.onmessage = event => {
+        const msg = event.data
+
+        if (!isValidBroadcastMessage(msg)) {
+          logger.error('Invalid Broadcast message', msg)
+          return
+        }
+        logger.debug('Received broadcast message', msg)
+
+        const { name, args } = msg
+        this.emit(name, args)
+      }
+    }
+  }
+}
+
+module.exports = IPC
+
+/**
+ * Validate an IPC message
+ *
+ * @param {any} message
+ * @returns {message is import('./utils/types').IpcResponse}
+ */
+function isValidIpcMessage (message) {
+  if (!message) return false
+  if (typeof message.type !== 'string') return false
+  if (!(message.type === 'reply' || message.type === 'error')) return false
+  if (typeof message.id !== 'number') return false
+  return true
+}
+
+/**
+ * Validate a broadcast message
+ *
+ * @param {any} message
+ * @returns {message is import('./utils/types').IpcBroadcast}
+ */
+function isValidBroadcastMessage (message) {
+  if (!message) return false
+  if (typeof message.name !== 'string') return false
+  return true
+}
diff --git a/src/logger.js b/src/logger.js
index 3f654444b..c343ea9f4 100644
--- a/src/logger.js
+++ b/src/logger.js
@@ -3,6 +3,7 @@ const path = require('path')
 const DailyRotateFile = require('winston-daily-rotate-file')
 const util = require('util')
 const { format } = require('date-fns')
+const isDev = require('electron-is-dev')
 
 const store = require('./store')
 const appVersion = require('../package.json').version
@@ -19,16 +20,13 @@ class Logger {
     this._debug = store.get('debugging')
   }
 
-  configure ({
-    userDataPath,
-    isDev,
-    label
-  }) {
-    this.isDev = isDev
+  configure ({ userDataPath, label }) {
     this._startBugsnag(isDev ? 'development' : 'production')
-    const prettyPrint = winston.format.printf(({ level, message, label, timestamp }) => {
-      return `${timestamp} [${label}] ${level}: ${message}`
-    })
+    const prettyPrint = winston.format.printf(
+      ({ level, message, label, timestamp }) => {
+        return `${timestamp} [${label}] ${level}: ${message}`
+      }
+    )
 
     this.winston.format = winston.format.combine(
       winston.format.label({ label }),
@@ -43,7 +41,7 @@ class Logger {
       }
     }
 
-    const mainLog = new (DailyRotateFile)({
+    const mainLog = new DailyRotateFile({
       filename: '%DATE%.log',
       dirname: this.dirname,
       datePattern: 'YYYY-MM-DD',
@@ -54,7 +52,7 @@ class Logger {
     mainLog.name = 'main'
     this.winston.add(mainLog)
 
-    const errorTransport = new (DailyRotateFile)({
+    const errorTransport = new DailyRotateFile({
       filename: '%DATE%.error.log',
       dirname: this.dirname,
       datePattern: 'YYYY-MM',
@@ -65,9 +63,11 @@ class Logger {
     this.winston.add(errorTransport)
 
     if (isDev) {
-      this.winston.add(new winston.transports.Console({
-        level: 'debug'
-      }))
+      this.winston.add(
+        new winston.transports.Console({
+          level: 'debug'
+        })
+      )
     }
     this.configured = true
     if (this._messageQueue.length > 0) this._drainQueue()
@@ -108,7 +108,7 @@ class Logger {
         message: util.format(...args)
       })
       if (level === 'error') {
-        Bugsnag.notify(args[1], (event) => {
+        Bugsnag.notify(args[1], event => {
           event.context = args[0]
         })
       }
@@ -132,6 +132,21 @@ class Logger {
     this._log('debug', Array.from(arguments))
   }
 
+  /**
+   * Log the time for a promise to resolve
+   *
+   * @template T
+   * @param {Promise<T>} promise
+   * @param {string} msg
+   * @returns {Promise<T>}
+   */
+  async timedPromise (promise, msg) {
+    const start = Date.now()
+    const result = await promise
+    this.info(`${msg} ${Date.now() - start}ms`)
+    return result
+  }
+
   _startBugsnag (releaseStage) {
     // This is really hacky because the @bugsnag/js package
     // does not properly handle an electron background
diff --git a/src/main/background-process.js b/src/main/background-process.js
new file mode 100644
index 000000000..6173d5c26
--- /dev/null
+++ b/src/main/background-process.js
@@ -0,0 +1,380 @@
+// @ts-check
+
+const path = require('path')
+const { once } = require('events')
+const { TypedEmitter } = require('tiny-typed-emitter')
+const { BrowserWindow, ipcMain } = require('electron')
+const pDefer = require('p-defer')
+
+const logger = require('../logger')
+
+// Timeout waiting for a worker to close gracefully before it is force-closed
+const CLOSE_TIMEOUT = 5000
+// Timeout waiting for a worker to start
+const STARTUP_TIMEOUT = 10000
+const bootstrapHTMLPath = path.join(__dirname, '../background/index.html')
+/** @type {Set<string>} */
+const modulesList = new Set()
+
+/** @typedef {'idle' | 'starting' | 'started' | 'error' | 'closing' | 'closed'} StateValue */
+/** @typedef {{ value: StateValue, context?: any}} State */
+/**
+ * @typedef {Object} Events
+ * @property {(state: State) => void} state-change
+ * @property {(error?: Error) => void} error
+ */
+/**
+ * @typedef {Object} BackgroundProcessOptions
+ * @property {any} [args={}] Arguments to pass to the process at startup
+ * @property {boolean} [show=false] Show the window for the process
+ * @property {boolean} [devTools=false] Open devtools for the process
+ */
+
+/**
+ * Manage a process that runs in a background window. It's important with
+ * electron to not run any processor-intensive tasks in the main process, since
+ * that causes the UI to freeze. It's also important not to block the main
+ * process IPC, so we set up a MessageChannel directly between the worker and
+ * the client running in the main render process
+ *
+ * @extends {TypedEmitter<Events>}
+ */
+class BackgroundProcess extends TypedEmitter {
+  /**
+   * @param {string} modulePath
+   * @param {BackgroundProcessOptions} [options]
+   */
+  constructor (modulePath, { args = {}, show = false, devTools = false } = {}) {
+    super()
+    if (modulesList.has(modulePath)) {
+      throw new Error(
+        `A worker is already initialized for ${modulePath}. Currently only one worker instance per module is supported.`
+      )
+    }
+    this._modulePath = modulePath
+    modulesList.add(modulePath)
+    /** @type {State} */
+    this._state = { value: 'idle' }
+    // For logging
+    this._label = `[${path.basename(modulePath)}]`
+
+    /** @type {BrowserWindow | null} */
+    this._win = new BrowserWindow({
+      show,
+      title: path.relative(process.cwd(), modulePath),
+      webPreferences: {
+        nodeIntegration: true,
+        // Appended to process.argv
+        additionalArguments: [this._modulePath, JSON.stringify(args)],
+        // Don't throttle animations and timers when the page becomes background
+        backgroundThrottling: false,
+        // Don't run electron APIs and preload in a separate JavaScript context.
+        // In next version of Electron this will default to true, so
+        // future-proofing by explicitly setting this to false
+        contextIsolation: false
+      }
+    })
+
+    if (devTools) this._win.webContents.openDevTools()
+  }
+
+  /**
+   * @param {State} state
+   * @private
+   */
+  _setState (state) {
+    if (state === this._state) return
+    this._state = state
+    this.emit('state-change', state)
+    if (state.value === 'error') {
+      logger.error(`${this._label} Error: ${state.context.error}`)
+      this.emit('error', state.context.error)
+    } else {
+      logger.debug(`${this._label} State change: ${state.value}`)
+    }
+  }
+
+  /**
+   * Resolves when the worker is ready (in 'started' state). Will throw if the
+   * worker is in the 'error', 'closing' or 'closed' state, because it will
+   * never be 'ready' in those states
+   *
+   * @returns {Promise<void>}
+   * @private
+   */
+  async _ready () {
+    if (
+      this._state.value === 'error' ||
+      this._state.value === 'closing' ||
+      this._state.value === 'closed'
+    ) {
+      throw new Error(`Worker is in '${this._state.value}' state`)
+    }
+    if (this._state.value === 'started') return
+    return new Promise((resolve, reject) => {
+      const _this = this
+      this.on('state-change', onStateChange)
+
+      function onStateChange (/** @type {State} */ state) {
+        if (state.value === 'error') {
+          _this.off('state-change', onStateChange)
+          reject(state.context && state.context.error)
+        } else if (state.value === 'started') {
+          _this.off('state-change', onStateChange)
+          resolve()
+        }
+        // otherwise keep waiting...
+      }
+    })
+  }
+
+  /**
+   * Get the current state of the worker
+   *
+   * @returns {State}
+   */
+  getState () {
+    return this._state
+  }
+
+  /**
+   * Start the worker in a new BrowserWindow window.
+   *
+   * Each worker can only be spawned once. Attempting to spawn a worker that is
+   * already running will throw an error.
+   *
+   * @returns {Promise<any>} Resolves once the worker is running, returning the
+   * value returned by the worker startup script
+   */
+  async start () {
+    const win = this._win
+    if (this._state.value !== 'idle') {
+      throw new Error(
+        `The process is currenting ${this._state.value}. Currently each process can only be started once`
+      )
+    }
+    if (!win) {
+      throw new Error(
+        'Process has been stopped. Currently each process cannot be restarted'
+      )
+    }
+    const deferred = pDefer()
+    const _this = this
+
+    this._setState({ value: 'starting' })
+
+    win.on('closed', () => {
+      this._win = null
+      this._setState({ value: 'closed' })
+    })
+
+    win.webContents.once('render-process-gone', (event, details) => {
+      if (details.reason === 'clean-exit') {
+        this._setState({ value: 'closed' })
+      } else {
+        this._setState({ value: 'error', context: { ...details } })
+      }
+    })
+
+    const timeoutId = setTimeout(() => {
+      win.webContents.off('ipc-messsage', onMessage)
+      const error = new Error('Process failed to start')
+      this._setState({ value: 'error', context: { error } })
+      deferred.reject(error)
+    }, STARTUP_TIMEOUT)
+
+    win.webContents.on('ipc-message', onMessage)
+
+    try {
+      // await 'did-finish-load'
+      await win.loadFile(bootstrapHTMLPath)
+    } catch (e) {
+      this._setState({ value: 'error', context: { error: e } })
+      throw e
+    }
+
+    return deferred.promise
+
+    /**
+     * @param {Electron.Event} event
+     * @param {string} channel
+     * @param {Error} error
+     * @param {any} config
+     */
+    function onMessage (event, channel, error, config) {
+      if (channel !== 'startup') return
+
+      clearTimeout(timeoutId)
+      win && win.webContents.off('ipc-message', onMessage)
+
+      if (error) {
+        _this._setState({ value: 'error', context: { error } })
+        deferred.reject(error)
+      } else {
+        _this._setState({ value: 'started' })
+        deferred.resolve(config)
+      }
+    }
+  }
+
+  /**
+   * Add a new client to the process (use when the main renderer first loads or reloads)
+   *
+   * @param {import('electron').MessagePortMain} port A port returned from new MessagePortMain()
+   * @returns {Promise<void>}
+   */
+  async addClient (port) {
+    if (!this._win) {
+      throw new Error('Unexpected error, window is not defined')
+    }
+    await this._ready()
+    this._win.webContents.postMessage('new-client', null, [port])
+  }
+
+  /**
+   * Stop the process gracefully, promise resolves when process is closed
+   *
+   * @param {object} [options]
+   * @param {number} [options.timeout] Timeout before worker is force-closed, default to CLOSE_TIMEOUT = 5000
+   * @returns {Promise<void>}
+   */
+  async stop ({ timeout = CLOSE_TIMEOUT } = {}) {
+    if (!this._win) return
+
+    this._setState({ value: 'closing' })
+
+    const timeoutId = setTimeout(() => {
+      this._win && this._win.destroy()
+      this._setState({ value: 'closed' })
+    }, timeout)
+
+    this._win.close()
+    await once(this._win, 'closed')
+    clearTimeout(timeoutId)
+    this._win = null
+    this._setState({ value: 'closed' })
+  }
+}
+
+/**
+ * Manage multiple background processes, starting and stopping them together and
+ * attaching BrowserWindow instances
+ *
+ * @extends {TypedEmitter<{'state-change': (state: Record<string, State>) => void, error: (error?: Error) => void }>}
+ */
+class BackgroundProcessManager extends TypedEmitter {
+  constructor () {
+    super()
+    /** @type {Map<string, BackgroundProcess>} */
+    this._processes = new Map()
+    /** @type {Map<BrowserWindow, () => void>} */
+    this._subscriptions = new Map()
+  }
+
+  /**
+   * Create a background process to be managed
+   *
+   * @param {string} modulePath Path to module to load in background process
+   * @param {BackgroundProcessOptions & { id: string }} options
+   */
+  createProcess (modulePath, { id, ...options }) {
+    const bp = new BackgroundProcess(modulePath, options)
+    this._processes.set(id, bp)
+    bp.on('state-change', state => {
+      this.emit('state-change', this.getState())
+    })
+    bp.on('error', error => {
+      this.emit('error', error)
+    })
+  }
+
+  /**
+   * Get the combined state of all background processes
+   *
+   * @returns {Record<string, State>}
+   */
+  getState () {
+    /** @type {Record<string, State>} */
+    const state = {}
+    for (const [id, bp] of this._processes) {
+      state[id] = bp.getState()
+    }
+    return state
+  }
+
+  /**
+   * Add a new client to a managed process (use when the main renderer first loads or reloads)
+   *
+   * @param {string} processId `id` of the managed process you want to add the client to
+   * @param {import('electron').MessagePortMain} port A port returned from new MessagePortMain()
+   * @returns {Promise<void>}
+   */
+  async addClient (processId, port) {
+    const bp = this._processes.get(processId)
+    if (!bp) {
+      throw new Error('No process found with id ' + processId)
+    }
+    return bp.addClient(port)
+  }
+
+  /**
+   * Subscribe a BrowserWindow to receive 'background-state' events
+   * whenever the state changes, and respond to a
+   * ipcRenderer.invoke('get-background-state')
+   *
+   * @param {BrowserWindow} win
+   * @returns {() => void} Unsubscribe window to state updates
+   */
+  subscribeWindow (win) {
+    let unsubscribe = this._subscriptions.get(win)
+    // Don't subscribe if already subscribed
+    if (unsubscribe) return unsubscribe
+
+    ipcMain.handle('get-backend-state', event => {
+      if (event.sender !== win.webContents) return
+      return this.getState()
+    })
+
+    this.on('state-change', onStateChange)
+
+    /** @param {Record<string, State>} state */
+    function onStateChange (state) {
+      win.webContents.send('backend-state', state)
+    }
+
+    unsubscribe = () => {
+      this.off('state-change', onStateChange)
+      this._subscriptions.delete(win)
+    }
+    this._subscriptions.set(win, unsubscribe)
+
+    return unsubscribe
+  }
+
+  /**
+   * Start all background processes, resolves when all have started
+   * @returns {Promise<void>}
+   */
+  async startAll () {
+    const processes = Array.from(this._processes.entries())
+    await Promise.all(
+      processes.map(([id, bp]) =>
+        logger.timedPromise(bp.start(), `Started ${id} process`)
+      )
+    )
+  }
+
+  /**
+   * Stop all background processes and unsubscribe any subscribed windows,
+   * resolves when all have stopped
+   * @returns {Promise<void>}
+   */
+  async stopAll () {
+    for (const unsubscribe of this._subscriptions.values()) {
+      unsubscribe()
+    }
+    await Promise.all([...this._processes.values()].map(bp => bp.stop()))
+  }
+}
+
+module.exports = BackgroundProcessManager
diff --git a/src/main/exit-hook.js b/src/main/exit-hook.js
new file mode 100644
index 000000000..9485943ec
--- /dev/null
+++ b/src/main/exit-hook.js
@@ -0,0 +1,23 @@
+const onExit = require('capture-exit')
+const signalExit = require('signal-exit')
+const once = require('once')
+const { app } = require('electron')
+
+onExit.captureExit()
+
+/**
+ * Call a function before the app exits - sledgehammer approach to capture all
+ * possible exit scenarios and allow an async exit hook
+ *
+ * @param {() => void} callback Callback to run before exit
+ */
+module.exports = function (callback) {
+  callback = once(callback)
+  onExit.onExit(callback)
+  signalExit(callback, { alwaysLast: true })
+  app.on('before-quit', e => {
+    // Cancel quit and wait for server to close
+    if (e) e.preventDefault()
+    callback()
+  })
+}
diff --git a/src/main/index.js b/src/main/index.js
index 84c83db1c..b7621a842 100644
--- a/src/main/index.js
+++ b/src/main/index.js
@@ -1,118 +1,250 @@
-const rabbit = require('electron-rabbit')
+// @ts-check
+
 const path = require('path')
-const events = require('events')
+const { app, dialog, MessageChannelMain, ipcMain } = require('electron')
+const isDev = require('electron-is-dev')
+const contextMenu = require('electron-context-menu')
+const mkdirp = require('mkdirp')
 
+const onExit = require('./exit-hook')
+const BackgroundProcessManager = require('./background-process')
+const createMenu = require('./menu')
+const updater = require('./auto-updater')
 const logger = require('../logger')
-const NodePIDmanager = require('../pid-manager')
+const electronIpc = require('./ipc')
+const ClientIpc = require('../client-ipc')
+const { MainWindow, LoadingWindow, ClosingWindow } = require('./windows')
+const { once } = require('events')
 
-class Socket {
-  constructor (socketName) {
-    this.name = socketName
-    this.ipc = new rabbit.Client()
-  }
+/** @typedef {import('../utils/types').MapeoCoreOptions} MapeoCoreOptions */
+/** @typedef {import('electron').BrowserWindow} BrowserWindow */
 
-  findSocket (cb) {
-    rabbit.findOpenSocket(this.name).then((socketName) => {
-      this.name = socketName
-      cb(socketName)
-    }).catch((err) => {
-      logger.error(err)
-      throw new Error('No socket found!', err)
-    })
-  }
+// Path to `userData`, operating system specific, see
+// https://github.com/atom/electron/blob/master/docs/api/app.md#appgetpathname
+var userDataPath = app.getPath('userData')
+
+module.exports = startup
+
+/**
+ * Start the Mapeo app
+ *
+ * @param {object} options
+ * @param {number} options.mapeoServerPort
+ * @param {number} options.tileServerPort
+ * @param {number} options.mapPrinterPort
+ * @param {string} options.datadir Path to dir for all Mapeo data
+ * @param {boolean} [options.debug]
+ * @param {boolean} [options.headless]
+ */
+async function startup ({
+  mapeoServerPort,
+  tileServerPort,
+  mapPrinterPort,
+  debug = false,
+  headless = false,
+  datadir
+}) {
+  // Before we do anything, let's make sure we're ready to gracefully shut down
+  onExit(beforeQuit)
+
+  /** @type {'loading' | 'ready' | 'exiting'} */
+  let status = 'loading'
+
+  // Configure context menu
+  contextMenu({
+    showLookUpSelection: false,
+    showCopyImage: true,
+    showSaveImageAs: true,
+    showInspectElement: isDev
+  })
+
+  // Set up Electron IPC bridge with frontend in electron-renderer process
+  electronIpc(ipcSend)
 
-  connectToOpenSocket (cb) {
-    this.findSocket(() => {
-      this.ipc.connect(this.name)
-      cb()
-    })
+  // Window Management
+  /** @type {BrowserWindow | null} */
+  let winMain = MainWindow({ mapeoServerPort, tileServerPort, mapPrinterPort })
+  if (debug) winMain.webContents.openDevTools()
+  /** @type {BrowserWindow | null} */
+  let winLoading = LoadingWindow()
+  /** @type {BrowserWindow | null} */
+  let winClosing = ClosingWindow()
+
+  winMain.on('close', () => beforeQuit())
+
+  /** @type {import('../utils/types').MapeoCoreOptions} */
+  const mapeoCoreArgs = {
+    datadir,
+    mapeoServerPort,
+    tileServerPort,
+    userDataPath
   }
-}
+  /** @type {import('../utils/types').MapPrinterOptions} */
+  const mapPrinterArgs = {
+    mapPrinterPort
+  }
+
+  // Background processes
+  const backgroundProcesses = new BackgroundProcessManager()
+  backgroundProcesses.createProcess(
+    path.join(__dirname, '../background/mapeo-core'),
+    { id: 'mapeoCore', args: mapeoCoreArgs, devTools: debug }
+  )
+  backgroundProcesses.createProcess(
+    path.join(__dirname, '../background/map-printer'),
+    { id: 'mapPrinter', args: mapPrinterArgs, devTools: debug }
+  )
+
+  // Subscribe the main window to background process state changes
+  const unsubscribeMainWindow = backgroundProcesses.subscribeWindow(winMain)
+
+  app.on('second-instance', () => {
+    // Someone tried to run a second instance, we should focus our window.
+    logger.debug('Second instance of app detected, bringing focus to here')
+    const win =
+      status === 'loading'
+        ? winLoading
+        : status === 'ready'
+        ? winMain
+        : winClosing
+    if (win) {
+      if (win.isMinimized()) win.restore()
+      win.focus()
+    }
+  })
+
+  ipcMain.on('mapeo-client', event => {
+    // This is called first time the main window loads, and whenever it reloads
+    logger.debug('Adding new client to Mapeo Core')
+    const port = event.ports[0]
+    backgroundProcesses.addClient('mapeoCore', port)
+    // TODO: Remove client when window reloads? Is this a significant leak?
+  })
+
+  try {
+    // Show loading window straight away
+    // TODO: Start other tasks in parallel to this await, but is it worth it?
+    await logger.timedPromise(
+      winLoading.loadFile(LoadingWindow.filePath),
+      'Loaded loading window'
+    )
+    winLoading.show()
+
+    // Set up a message channel & IPC for communicating between the main process
+    // and Mapeo Core, and create the app menu with this IPC channel Once Mapeo
+    // Core is loaded, need to pass it port2 - messages will be queued until a
+    // listener is attached to port2
+    // TODO: Work with raw MessagePort not ClientIpc wrapper
+    const { port1, port2 } = new MessageChannelMain()
+    const ipc = new ClientIpc({ port: port1 })
+    createMenu(ipc)
+    backgroundProcesses.addClient('mapeoCore', port2)
 
-class Main extends events.EventEmitter {
-  constructor ({
-    userDataPath,
-    isDev
-  }) {
-    super()
-    this.isDev = isDev
-    this.pid = new NodePIDmanager(userDataPath)
-
-    this.mapeo = new Socket('mapeo')
-    this.mapPrinter = new Socket('mapPrinter')
-    this.mapeo.ipc.on('error', (err) => {
-      this.emit('error', err)
-    })
-    this.pid.on('close', (err) => {
-      if (err) this.emit('error', err)
-    })
+    await logger.timedPromise(
+      Promise.all([
+        // Create folders for data, custom presets, and custom styles
+        mkdirp(datadir),
+        mkdirp(path.join(userDataPath, 'presets')),
+        mkdirp(path.join(userDataPath, 'styles')),
+        // Startup background processes and servers
+        logger.timedPromise(
+          backgroundProcesses.startAll(),
+          'Started background processes'
+        ),
+        // Load main window and show it when it has loaded
+        logger.timedPromise(loadMainWindow(), 'First render in main window')
+      ]),
+      'Frontend & backend ready'
+    )
+
+    if (debug) winMain.webContents.openDevTools()
+    winLoading.hide()
+    status = 'ready'
+
+    // Load closing window, so it's ready when we need it
+    winClosing.loadFile(ClosingWindow.filePath)
+
+    // Start checking for in-app updates
+    updater.periodicUpdates()
+  } catch (err) {
+    onError(err)
   }
 
-  ready () {
-    return new Promise((resolve, reject) => {
-      logger.info('waiting')
-      this.pid.cleanup((err) => {
-        if (err) logger.debug('No stale processes to clean up')
-        else logger.debug('Successfully removed any stale processes')
-        var pending = 2
-        this.mapeo.connectToOpenSocket(() => {
-          if (--pending === 0) _ready()
-        })
-        this.mapPrinter.connectToOpenSocket(() => {
-          if (--pending === 0) _ready()
-        })
-      })
-
-      var _ready = () => {
-        logger.info('resolve')
-        this.emit('ready')
-        resolve()
-      }
-    })
+  // Load main window but wait for first render before showing
+  async function loadMainWindow () {
+    winMain &&
+      (await logger.timedPromise(
+        winMain.loadFile(MainWindow.filePath),
+        'Main window load'
+      ))
+    await once(ipcMain, 'frontend-rendered')
+    winMain && winMain.show()
   }
 
-  startMapeoNodeIPC () {
-    this.pid.create({
-      socketName: this.mapeo.name,
-      filepath: path.join(__dirname, '..', 'background', 'mapeo-core', 'index.js')
-    }, (err, process) => {
-      if (err) logger.error('Failed to start Mapeo Core', err)
-    })
+  /**
+   * Attempt to send an electron IPC message to the main window, return false if
+   * unable to send, used to show error messages in a dialog if the main window
+   * is not available.
+   *
+   * @param {any[]} args
+   * @returns {boolean} true if could send IPC to main window
+   */
+  function ipcSend (...args) {
+    try {
+      if (winMain && winMain.webContents) {
+        winMain.webContents.send.apply(winMain.webContents, args)
+        return true
+      } else return false
+    } catch (e) {
+      logger.error(
+        'exception win.webContents.send ' + JSON.stringify(args),
+        e.stack
+      )
+      return false
+    }
   }
 
-  close (cb) {
-    var _close = () => {
-      this.pid.cleanup((err) => {
-        if (err) {
-          this.isDev
-            ? logger.debug('Nothing to clean up')
-            : logger.error('Failed to clean up a child process', err)
-        }
-        logger.debug('Successfully removed any stale processes')
-        cb()
-      })
+  /**
+   * Try to send the error to the render process, to show a friendly error to
+   * the user, but if the main window is not open, then we need to resort to the
+   * ugly Electron dialog for showing the error
+   *
+   * @param {Error} err
+   */
+  function onError (err) {
+    if (!ipcSend('error', err.toString())) {
+      dialog.showErrorBox('Error', err.toString())
     }
+  }
+
+  async function beforeQuit () {
+    if (status === 'exiting') return
+    status = 'exiting'
+    logger.debug('Exiting app')
+
+    // Close main window straight away
+    unsubscribeMainWindow()
+    winMain && winMain.close()
+    winLoading && winLoading.close()
+
+    // If closing is taking longer, show closing window
+    const timeoutId = setTimeout(() => {
+      winClosing && winClosing.show()
+    }, 300)
 
-    logger.info('process?', !!this.pid.process)
-    if (!this.pid.process) return _close()
-
-    this.mapeo.ipc.send('get-replicating-peers', null, (err, peers) => {
-      if (err) logger.error(err)
-      logger.info(peers, 'peers still replicating upon close')
-      // If there are peers still replicating, give Mapeo
-      // 5 minutes to complete replication.
-      // If no peers are replicating, give Mapeo core 3 seconds before
-      // sending the kill signal
-      var timeout = setTimeout(() => {
-        _close()
-      }, peers > 0 ? 1000 * 60 * 5 : 7000)
-      this.mapeo.ipc.send('close', null, () => {
-        logger.debug('IPC closed')
-        clearTimeout(timeout)
-        _close()
-      })
-    })
+    // Close background processes
+    await logger.timedPromise(
+      backgroundProcesses.stopAll(),
+      'Stopped background processes'
+    )
+    clearTimeout(timeoutId)
+
+    winClosing && winClosing.close()
+    // De-reference all windows to allow garbage collection
+    winClosing = null
+    winMain = null
+    winLoading = null
+
+    app.exit()
   }
 }
-
-module.exports = Main
diff --git a/src/main/ipc.js b/src/main/ipc.js
index 21ac3daaf..004848b82 100644
--- a/src/main/ipc.js
+++ b/src/main/ipc.js
@@ -9,12 +9,13 @@ const i18n = require('./i18n')
  * Miscellaneous ipcMain calls that don't hit mapeo-core
  */
 module.exports = function (ipcSend) {
+  console.log('IPC main')
   function onError (err) {
     logger.error('[MAIN/IPC] error', err)
     ipcSend('error', err.message, err.stack)
   }
 
-  updater.on('error', (err) => {
+  updater.on('error', err => {
     if (err.message.match(/net*/)) logger.debug(err.message)
     else {
       logger.error('[UPDATER] error', err)
@@ -26,7 +27,7 @@ module.exports = function (ipcSend) {
     ipcSend('update-status', 'update-inactive')
   })
 
-  updater.updateDownloaded((updateInfo) => {
+  updater.updateDownloaded(updateInfo => {
     logger.info('[UPDATER] update-downloaded', updateInfo)
     ipcSend('update-status', 'update-downloaded', updateInfo)
   })
@@ -36,7 +37,7 @@ module.exports = function (ipcSend) {
     ipcSend('update-status', 'update-not-available', null)
   })
 
-  updater.downloadProgress((updateInfo) => {
+  updater.downloadProgress(updateInfo => {
     logger.info('[UPDATER] update-progress', updateInfo)
     /*
       {
@@ -53,7 +54,7 @@ module.exports = function (ipcSend) {
     ipcSend('update-status', 'update-progress', updateInfo)
   })
 
-  updater.updateAvailable((updateInfo) => {
+  updater.updateAvailable(updateInfo => {
     // version, files, path, sha512, releaseDate
     logger.info('[UPDATER] update-available', updateInfo)
     ipcSend('update-status', 'update-available', updateInfo)
@@ -93,8 +94,8 @@ module.exports = function (ipcSend) {
   ipcMain.on('save-file', function () {
     var metadata = userConfig.getSettings('metadata')
     var ext = metadata ? metadata.dataset_id : 'mapeodata'
-    dialog.showSaveDialog(
-      {
+    dialog
+      .showSaveDialog({
         title: i18n.t('save-db-dialog'),
         defaultPath: 'database.' + ext,
         filters: [
@@ -103,8 +104,9 @@ module.exports = function (ipcSend) {
             extensions: ['mapeodata', 'mapeo-jungle', ext]
           }
         ]
-      }
-    ).then(onOpen).catch(onError)
+      })
+      .then(onOpen)
+      .catch(onError)
 
     function onOpen ({ filePath, canceled }) {
       if (canceled || typeof filePath === 'undefined') return
@@ -115,8 +117,8 @@ module.exports = function (ipcSend) {
   ipcMain.on('open-file', function () {
     var metadata = userConfig.getSettings('metadata')
     var ext = metadata ? metadata.dataset_id : 'mapeodata'
-    dialog.showOpenDialog(
-      {
+    dialog
+      .showOpenDialog({
         title: i18n.t('open-db-dialog'),
         properties: ['openFile'],
         filters: [
@@ -125,8 +127,9 @@ module.exports = function (ipcSend) {
             extensions: ['mapeodata', 'mapeo-jungle', ext, 'sync', 'zip']
           }
         ]
-      }
-    ).then(onOpen).catch(onError)
+      })
+      .then(onOpen)
+      .catch(onError)
 
     function onOpen ({ canceled, filePaths }) {
       if (canceled || typeof filePaths === 'undefined') return
diff --git a/src/main/pid-cleanup.js b/src/main/pid-cleanup.js
new file mode 100644
index 000000000..66e77f6ce
--- /dev/null
+++ b/src/main/pid-cleanup.js
@@ -0,0 +1,59 @@
+// @ts-check
+
+const path = require('path')
+const { promises: fs } = require('fs')
+const terminate = require('terminate')
+const { app } = require('electron')
+
+const logger = require('../logger')
+
+/**
+ * Check for existing orphaned processes and terminate them. Writes the current
+ * pid to file so that this process can be cleaned up later if necessary
+ *
+ * @returns {Promise<void>}
+ */
+module.exports = async function cleanUpOrphanProcesses () {
+  const pidFilepath = path.join(app.getPath('userData'), 'pid')
+
+  /** @type {number | undefined} */
+  let existingPid
+  try {
+    existingPid = parseInt((await fs.readFile(pidFilepath)).toString())
+  } catch (e) {}
+
+  const asyncTasks = [fs.writeFile(pidFilepath, process.pid.toString())]
+
+  if (existingPid) {
+    asyncTasks.push(terminatePromise(existingPid))
+  }
+
+  // Minimize wait, run async tasks in parallel
+  await Promise.all(asyncTasks)
+
+  // Not registering exit handlers for cleanup of the PID, since this could
+  // cause race conditions. Better leave the PID file there, even if process
+  // exists gracefully, and try and fail to terminate it on startup
+}
+
+/**
+ * async terminate
+ *
+ * @param {number} pid
+ * @returns {Promise<void>}
+ */
+async function terminatePromise (pid) {
+  return new Promise((resolve, reject) => {
+    terminate(pid, err => {
+      if (err && err.code !== 'ESRCH') {
+        // A problem terminating an orphaned process, but we can't do much about
+        // it other than log the problem
+        logger.error('pid-manager', err)
+        resolve()
+      } else {
+        logger.debug('Cleaned up existing process pid:', pid)
+        resolve()
+      }
+    })
+  })
+}
diff --git a/src/main/user-config.js b/src/main/user-config.js
index b3fd9db18..da4404d91 100644
--- a/src/main/user-config.js
+++ b/src/main/user-config.js
@@ -1,13 +1,9 @@
 const app = require('electron').app
-const fs = require('fs-extra')
-const mkdirp = require('mkdirp')
 const Settings = require('@mapeo/settings')
-const path = require('path')
+const { RESOURCES_DIR } = require('../../config')
 
 const logger = require('../logger')
 
-const DEFAULT_SETTINGS = 'DEFAULT_SETTINGS'
-
 function importSettings (settingsFile, cb) {
   var userDataPath = app.getPath('userData')
   var settings = new Settings(userDataPath)
@@ -35,39 +31,11 @@ function getSettings (type) {
 }
 
 function getFallbackSettings (type) {
-  var userDataPath = app.getPath('userData')
-  return new Settings(path.join(userDataPath, DEFAULT_SETTINGS)).getSettings(type)
-}
-
-function copyFallbackSettings (fallbackSettings, done) {
-  // location: the full pathname to the fallback default settings directory
-  // which is unzipped and includes presets.json, icons, etc
-  // e.g., /path/to/Users/miranda/Mapeo/presets/my-default-fallback-settings/
-
-  // XXX: mapeo-server's static router expects
-  //  - userDataPath/presets/default  ~or~
-  //  - fallbackPresetsDir/presets/default
-  // And we can't copy these styles directly into
-  // ... /userDataPath/presets/default, because Windows will throw
-  // an EPERM error if you try to copy over them when importing configurations
-
-  // This can be cleaned up once imported configurations exist in their own
-  // directories, and presets don't get overridden or copied over each other.
-  const userDataPath = app.getPath('userData')
-  const defaultSettings = path.join(userDataPath, DEFAULT_SETTINGS, 'presets')
-  mkdirp.sync(defaultSettings)
-  fs.copy(fallbackSettings, path.join(defaultSettings, 'default'),
-    (err) => {
-      if (err) logger.error('[ERROR] while unpacking default presets', err)
-      else logger.info('Unpacked new default styles and presets')
-      done()
-    }
-  )
+  return new Settings(RESOURCES_DIR).getSettings(type)
 }
 
 module.exports = {
   importSettings,
   getSettings,
-  getEncryptionKey,
-  copyFallbackSettings
+  getEncryptionKey
 }
diff --git a/src/main/windows.js b/src/main/windows.js
new file mode 100644
index 000000000..f9d8966b3
--- /dev/null
+++ b/src/main/windows.js
@@ -0,0 +1,90 @@
+// @ts-check
+const { app, BrowserWindow } = require('electron')
+const path = require('path')
+
+const windowStateKeeper = require('./window-state')
+const logger = require('../logger')
+
+module.exports = {
+  MainWindow,
+  LoadingWindow,
+  ClosingWindow
+}
+
+MainWindow.filePath = path.join(__dirname, '../../static/main.html')
+
+/**
+ * @param {object} options
+ * @param {number} options.mapeoServerPort
+ * @param {number} options.tileServerPort
+ * @param {number} options.mapPrinterPort
+ * @returns {BrowserWindow}
+ */
+function MainWindow (options) {
+  var APP_NAME = app.getName()
+  const mainWindowState = windowStateKeeper({
+    defaultWidth: 1000,
+    defaultHeight: 800
+  })
+  var mainWindow = new BrowserWindow({
+    x: mainWindowState.x,
+    y: mainWindowState.y,
+    width: process.env.NODE_ENV === 'test' ? 1000 : mainWindowState.width,
+    height: process.env.NODE_ENV === 'test' ? 800 : mainWindowState.height,
+    title: APP_NAME,
+    show: false,
+    alwaysOnTop: false,
+    titleBarStyle: 'hidden',
+    icon: path.resolve(__dirname, '../../static/mapeo_256x256.png'),
+    webPreferences: {
+      nodeIntegration: true,
+      preload: path.resolve(__dirname, '../renderer/index-preload.js'),
+      additionalArguments: [JSON.stringify(options)],
+      contextIsolation: false
+    }
+  })
+  mainWindowState.manage(mainWindow)
+
+  mainWindow.webContents.on(
+    'did-fail-load',
+    (event, errorCode, errorDescription) => {
+      if (
+        errorDescription === 'ERR_INTERNET_DISCONNECTED' ||
+        errorDescription === 'ERR_PROXY_CONNECTION_FAILED'
+      ) {
+        logger.warn('Failed to load web contents', errorDescription)
+      } else {
+        logger.error(errorDescription)
+      }
+    }
+  )
+
+  return mainWindow
+}
+
+LoadingWindow.filePath = path.join(__dirname, '../../static/splash.html')
+
+function LoadingWindow () {
+  return new BrowserWindow({
+    width: 450,
+    height: 410,
+    center: true,
+    show: false,
+    transparent: true,
+    resizable: false,
+    frame: false
+  })
+}
+
+ClosingWindow.filePath = path.join(__dirname, '../../static/closing.html')
+
+function ClosingWindow () {
+  return new BrowserWindow({
+    width: 600,
+    height: 400,
+    center: true,
+    frame: false,
+    show: false,
+    alwaysOnTop: true
+  })
+}
diff --git a/src/pid-manager.js b/src/pid-manager.js
deleted file mode 100644
index b91ac1e74..000000000
--- a/src/pid-manager.js
+++ /dev/null
@@ -1,75 +0,0 @@
-const path = require('path')
-const fs = require('fs')
-const terminate = require('terminate')
-const { fork } = require('child_process')
-const events = require('events')
-
-const logger = require('./logger')
-
-class Worker extends events.EventEmitter {
-  constructor (userDataPath) {
-    super()
-    this.userDataPath = userDataPath
-    this.loc = path.join(userDataPath, 'pid')
-    this.process = null
-  }
-
-  create ({socketName, filepath}, cb) {
-    logger.debug('Creating subprocess', socketName, filepath)
-    this.cleanup((err) => {
-      if (err) logger.error(err)
-      logger.debug('Starting background process')
-      this.process = fork(filepath, [
-        '--subprocess',
-        socketName,
-        this.userDataPath
-      ])
-
-      this.process.on('error', (err) => {
-        if (this.process) this.emit('close', err)
-        this.process = null
-      })
-      this.process.on('exit', (code) => {
-        if (this.process) this.emit('close', null, code)
-        this.process = null
-      })
-      return cb(null, process)
-    })
-  }
-
-  _remove (cb) {
-    return fs.unlink(this.loc, cb)
-  }
-
-  _exists () {
-    return fs.existsSync(this.loc)
-  }
-
-  pid (cb) {
-    // Write the current pid of this process to the pid file.
-    var done = () => {
-      logger.debug('writing pid', process.pid)
-      fs.writeFile(this.loc, process.pid.toString(), cb)
-    }
-    if (this._exists()) this.cleanup(done)
-    else done()
-  }
-
-  read () {
-    return parseInt(fs.readFileSync(this.loc).toString())
-  }
-
-  cleanup (cb) {
-    if (this.process) this.process.kill()
-    this.process = null
-    if (!this._exists()) return cb()
-    var pid = this.read()
-    logger.info('Terminating PID', pid)
-    terminate(pid, (err) => {
-      if (err && err.code !== 'ESRCH') return cb(err)
-      this._remove(cb)
-    })
-  }
-}
-
-module.exports = Worker
diff --git a/src/renderer/app.js b/src/renderer/app.js
index 679a31ba0..fbd329510 100644
--- a/src/renderer/app.js
+++ b/src/renderer/app.js
@@ -6,7 +6,6 @@ import { IntlProvider } from 'react-intl'
 import isDev from 'electron-is-dev'
 import CssBaseline from '@material-ui/core/CssBaseline'
 
-import api from './new-api'
 import logger from '../logger'
 import theme from './theme'
 import Home from './components/Home'
@@ -46,18 +45,31 @@ if (!logger.configured) {
 
 const App = () => {
   const [locale, setLocale] = React.useState(initialLocale)
-  const [isReady, setReady] = React.useState(false)
+  const [backendState, setBackendState] = React.useState('loading')
 
   React.useEffect(() => {
-    ipcRenderer.once('back-end-ready', () => {
-      api.setBaseUrl('http://' + remote.getGlobal('osmServerHost') + '/')
-      api.setMapUrl('http://' + remote.getGlobal('mapPrinterHost') + '/')
-      console.log(remote.getGlobal('osmServerHost'))
-      console.log(remote.getGlobal('mapPrinterHost'))
-      setReady(true)
-    })
+    ipcRenderer
+      .invoke('get-backend-state')
+      .then(state => onStateChange(null, state))
+
+    ipcRenderer.on('backend-state', onStateChange)
+
+    function onStateChange (_, state) {
+      const newState = getMergedStateValue(state)
+      logger.debug('Backend state ' + newState, state)
+      setBackendState(newState)
+    }
+
+    return () => ipcRenderer.off(onStateChange)
   }, [])
 
+  React.useEffect(() => {
+    // Let main process know when the first render is complete, so that it can
+    // show this window and close the loading window
+    if (backendState !== 'ready') return
+    ipcRenderer.send('frontend-rendered')
+  }, [backendState])
+
   const handleLanguageChange = React.useCallback(lang => {
     ipcRenderer.send('set-locale', lang)
     setLocale(lang)
@@ -68,9 +80,8 @@ const App = () => {
     ipcRenderer.send('force-refresh-window')
   }, [])
   logger.info('Rendering', locale)
-  logger.info('Ready?', isReady)
 
-  return isReady ? (
+  return backendState === 'ready' ? (
     <StylesProvider injectFirst>
       <ThemeProvider theme={theme}>
         <CssBaseline />
@@ -90,3 +101,11 @@ window.testMode = function () {
   localStorage.removeItem('lastView')
   localStorage.removeItem('location')
 }
+
+function getMergedStateValue (state) {
+  const values = Object.values(state).map(s => s.value)
+  if (values.includes('error')) return 'error'
+  if (values.includes('loading')) return 'loading'
+  if (values.every(v => v === 'started')) return 'ready'
+  return 'unknown'
+}
diff --git a/src/renderer/components/MapEditor/index.js b/src/renderer/components/MapEditor/index.js
index 1b7b5fb79..23c4d5765 100644
--- a/src/renderer/components/MapEditor/index.js
+++ b/src/renderer/components/MapEditor/index.js
@@ -1,6 +1,6 @@
 import React from 'react'
 import ReactDOM from 'react-dom'
-import { ipcRenderer, remote, shell } from 'electron'
+import { ipcRenderer, shell } from 'electron'
 import iD from 'id-mapeo'
 import debounce from 'lodash/debounce'
 import insertCss from 'insert-css'
@@ -166,7 +166,7 @@ const MapEditor = () => {
       if (!rootRef.current) return
       updateSettings()
 
-      var serverUrl = 'http://' + remote.getGlobal('osmServerHost')
+      var serverUrl = `http://127.0.0.1:${window.mapeoServerPort}`
       id.current = window.id = iD
         .coreContext()
         .assetPath('../node_modules/id-mapeo/dist/')
diff --git a/src/renderer/index-preload.js b/src/renderer/index-preload.js
index ee9661b28..9baba47aa 100644
--- a/src/renderer/index-preload.js
+++ b/src/renderer/index-preload.js
@@ -1,7 +1,25 @@
-const { ipcRenderer } = require('electron')
-const middleware = require('electron-rabbit')
+const { ipcRenderer, remote } = require('electron')
+const IPC = require('../client-ipc')
+const logger = require('../logger')
 
-window.middlewareClient = new middleware.Client()
-ipcRenderer.on('set-socket', (event, { name }) => {
-  window.middlewareClient.connect(name)
-})
+/** @typedef {import('../utils/types').BackgroundProcess} BackgroundProcess */
+/** @typedef {import('../utils/types').IpcResponse} IpcResponse */
+
+const userDataPath = remote.app.getPath('userData')
+// The logger instance in preload is different from that in the main window
+// So we also need to configure it here
+logger.configure({ userDataPath, label: 'renderer-preload' })
+
+const { port1, port2 } = new MessageChannel()
+
+ipcRenderer.postMessage('mapeo-client', null, [port1])
+
+window.middlewareClient = new IPC({ port: port2 })
+
+const { mapeoServerPort, tileServerPort, mapPrinterPort } = JSON.parse(
+  process.argv[process.argv.length - 1]
+)
+
+window.mapeoServerPort = mapeoServerPort
+window.tileServerPort = tileServerPort
+window.mapPrinterPort = mapPrinterPort
diff --git a/src/renderer/new-api.js b/src/renderer/new-api.js
index 0b39aeac2..6932cec66 100644
--- a/src/renderer/new-api.js
+++ b/src/renderer/new-api.js
@@ -3,8 +3,10 @@ import ky from 'ky/umd'
 import logger from '../logger'
 
 export default Api({
-  // window.middlewareClient is set in src/middleware/client-preload.js
-  ipc: window.middlewareClient
+  // globals are set in src/middleware/client-preload.js
+  ipc: window.middlewareClient,
+  baseUrl: `http://127.0.0.1:${window.mapeoServerPort}/`,
+  mapUrl: `http://127.0.0.1:${window.mapPrinterPort}/`
 })
 
 function Api ({ baseUrl, mapUrl, ipc }) {
@@ -14,7 +16,7 @@ function Api ({ baseUrl, mapUrl, ipc }) {
   // style will be cache-busted.
   const startupTime = Date.now()
 
-  let req = ky.create({
+  const req = ky.create({
     prefixUrl: baseUrl,
     // No timeout because indexing after first sync takes a long time, which mean
     // requests to the server take a long time
@@ -34,6 +36,8 @@ function Api ({ baseUrl, mapUrl, ipc }) {
       .catch(error => {
         // Preset errors aren't fatal errors.
         if (prefix.indexOf('presets') > -1) logger.info(prefix, error)
+        // Styles errors aren't fatal errors either.
+        else if (prefix.indexOf('styles') > -1) logger.info(prefix, error)
         else logger.error(prefix, error)
       })
     return promise
@@ -54,21 +58,10 @@ function Api ({ baseUrl, mapUrl, ipc }) {
 
   // All public methods
   const api = {
-    // Hacky solution, probably need to create the api instance in the app, once
-    // the backend has loaded
-    setBaseUrl: function setBaseUrl (url) {
-      baseUrl = url
-      req = ky.extend({ prefixUrl: baseUrl })
-    },
-
     getBaseUrl: function getBaseUrl () {
       return baseUrl
     },
 
-    setMapUrl: function (url) {
-      mapUrl = url
-    },
-
     /**
      * GET async methods
      */
diff --git a/src/utils/async-server.js b/src/utils/async-server.js
new file mode 100644
index 000000000..8c166c40c
--- /dev/null
+++ b/src/utils/async-server.js
@@ -0,0 +1,31 @@
+// @ts-check
+const { promisify } = require('util')
+
+module.exports = {
+  listen,
+  close
+}
+
+/**
+ * Async server.listen()
+ *
+ * @param {import('http').Server} server
+ * @param {number} port
+ * @param {string} host
+ * @returns {Promise<string>} URL server is listening on
+ */
+async function listen (server, port, host) {
+  await promisify(server.listen.bind(server))(port, host)
+  const addInfo = /** @type {import('net').AddressInfo} */ (server.address())
+  return `http://${addInfo.address}:${addInfo.port}`
+}
+
+/**
+ * Async server.close()
+ *
+ * @param {import('http').Server} server
+ * @returns {Promise<void>}
+ */
+function close (server) {
+  return promisify(server.close.bind(server))()
+}
diff --git a/src/utils/get-ports.js b/src/utils/get-ports.js
new file mode 100644
index 000000000..f893f1f9e
--- /dev/null
+++ b/src/utils/get-ports.js
@@ -0,0 +1,16 @@
+const getPort = require('get-port')
+
+module.exports = getPorts
+
+/**
+ * Get multiple open ports from list of preferred ports
+ *
+ * @param {number[]} ports
+ * @returns {number[]}
+ */
+async function getPorts (ports) {
+  if (new Set(ports).size !== ports.length) {
+    throw new Error('Duplicate ports: ' + ports.join(', '))
+  }
+  return Promise.all(ports.map(port => getPort({ port })))
+}
diff --git a/src/utils/types.d.ts b/src/utils/types.d.ts
new file mode 100644
index 000000000..72bf02be8
--- /dev/null
+++ b/src/utils/types.d.ts
@@ -0,0 +1,22 @@
+type Handler = (...args: any[]) => Promise<any> | any
+
+export type BackgroundProcess = {
+  handlers: { [name: string]: Handler }
+  start?: () => Promise<any>
+  close?: () => Promise<void>
+}
+
+export type IpcRequest = { id: number; name: string; args: any }
+export type IpcResponse = { id: number; type: 'reply' | 'error'; result: any }
+export type IpcBroadcast = { name: string; type: 'push'; args: any }
+
+export type MapeoCoreOptions = {
+  datadir: string
+  userDataPath: string
+  mapeoServerPort: number
+  tileServerPort: number
+}
+
+export type MapPrinterOptions = {
+  mapPrinterPort: number
+}
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 000000000..1f74d1425
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,17 @@
+{
+  "compilerOptions": {
+    "module": "commonjs",
+    "target": "es2018",
+    "allowSyntheticDefaultImports": true,
+    "noImplicitAny": true,
+    "strictNullChecks": true,
+    "moduleResolution": "node",
+    "resolveJsonModule": true,
+    "allowJs": true,
+    "checkJs": false,
+    "noEmit": true,
+    "typeRoots": ["types", "node_modules/@types"]
+  },
+  "include": ["src/main/**/*", "src/workers/**/*", "index.js", "types/**/*"],
+  "exclude": ["node_modules"]
+}
diff --git a/types/terminate.d.ts b/types/terminate.d.ts
new file mode 100644
index 000000000..c238b5fe6
--- /dev/null
+++ b/types/terminate.d.ts
@@ -0,0 +1,10 @@
+declare module 'terminate' {
+  /**
+   * Terminate a Node.js Process (and all Child Processes) based on the Process ID
+   */
+  function terminate (
+    pid: number,
+    callback: (error: NodeJS.ErrnoException) => void
+  ): void
+  export = terminate
+}