Manufactured - Back-end test

Welcome to the technical test for back-end developers. For this test, you'll need to make a simple HTTP server that aggregates data fetched from our GraphQL API. Make sure to read all the way to the end before starting.

Requirements

• Make a private repo on Github
• Use TypeScript or JavaScript, ideally TypeScript. Other than that you can freely choose which libraries you use
• Create a server that handles a single route. If using REST then GET /stats, otherwise if GraphQL then query stats() { ... }
• The endpoint must run the query described below in Query and output the response described in Response
• Include a README.md that describes the steps needed to run your project and anything you might like to clarify
• You are done! invite flesler to the repo for reviewing and email your point of contact

Response

The endpoint should respond with a payload similar to this, based on messages' text (more on that below). The provided values are all realistic but fake:

{
  "messages": 88,
  "queries": 5,
  "responseTimes": {
    "min": 1500,
    "avg": 5000,
    "max": 80000
  },
  "characters": {
    "min": 20,
    "avg": 400,
    "max": 3000
  },
  "words": {
    "min": 3,
    "avg": 15,
    "max": 200
  },
  "numbers": {
    "min": 0,
    "avg": 1,
    "max": 4
  }
}

queries should count how many queries were performed to the GraphQL API for this request. responseTimes should be calculated as the difference in milliseconds between each Message's createdAt and the next one. numbers should count the amount of sequential numbers in the text. In all cases min should have the minimum value across all messages, avg the average and max the maximum. The rest should be self-explanatory.

Query

You need to hit the GraphQL API at https://dev.gql.manufactured.com/graphql. You can use any tool, we provide a very simple example using graphql-request you are free to use it & extend it or to use something else entirely. You can try it with npm start.

The example script includes a basic query to get a single page of messages. It has a valid authentication token, the $channelId you should use with it and a $pageSize of 20. You'll load messages in batches of 20 so you'll need to implement pagination by extending the given code at least a bit. You can either use offset-based pagination by passing an input.page.offset or cursor-based by passing a cursor in input.page.after. You should rely on the text property of each Message to calculate the stats described below.

You can check the docs for the query by going to https://dev.gql.manufactured.com/graphql and clicking DOCS on the right side. The first query (channel) is the one you need. Here's a GIF to hopefully save you some time:

Bonus points

You'll get bonus points the more you include from the following list:

• In your repo, write in what way would you improve, optimize and/or harden your server (textual, no need to code)
• Do not count as numbers things like times, dates, product versions, etc. Only count actual numbers (1 or many digits)
• If you have used offset-based pagination, instead use cursor-based pagination
• Add emojis (with min, avg, max) to the response, counting the number of emojis in messages
• Add verbs (with min, avg, max) to the response, counting the number of verbs in messages
• Add nouns (with min, avg, max) to the response, counting the number of nouns in messages
• Strongly type your query by using a tool like GraphQL code generator with typescript-graphql-request.

Final Notes

If you have any questions or something in the API is not working as expected, feel free to consult us via email.