diff --git a/xarray/backends/api.py b/xarray/backends/api.py
index 9f45474e7e7..47f46e73218 100644
--- a/xarray/backends/api.py
+++ b/xarray/backends/api.py
@@ -36,7 +36,6 @@
     except ImportError:
         Delayed = None
 
-
 DATAARRAY_NAME = "__xarray_dataarray_name__"
 DATAARRAY_VARIABLE = "__xarray_dataarray_variable__"
 
@@ -446,6 +445,7 @@ def open_dataset(
 
     if backend_kwargs is None:
         backend_kwargs = {}
+    extra_kwargs = {}
 
     def maybe_decode_store(store, lock=False):
         ds = conventions.decode_cf(
@@ -504,28 +504,24 @@ def maybe_decode_store(store, lock=False):
 
         if engine is None:
             engine = _get_default_engine(filename_or_obj, allow_remote=True)
-        if engine == "netcdf4":
-            store = backends.NetCDF4DataStore.open(
-                filename_or_obj, group=group, lock=lock, **backend_kwargs
-            )
-        elif engine == "scipy":
-            store = backends.ScipyDataStore(filename_or_obj, **backend_kwargs)
-        elif engine == "pydap":
-            store = backends.PydapDataStore.open(filename_or_obj, **backend_kwargs)
-        elif engine == "h5netcdf":
-            store = backends.H5NetCDFStore.open(
-                filename_or_obj, group=group, lock=lock, **backend_kwargs
-            )
-        elif engine == "pynio":
-            store = backends.NioDataStore(filename_or_obj, lock=lock, **backend_kwargs)
-        elif engine == "pseudonetcdf":
-            store = backends.PseudoNetCDFDataStore.open(
-                filename_or_obj, lock=lock, **backend_kwargs
-            )
-        elif engine == "cfgrib":
-            store = backends.CfGribDataStore(
-                filename_or_obj, lock=lock, **backend_kwargs
-            )
+
+        backend_switch = {
+            "netcdf4": backends.NetCDF4DataStore.open,
+            "scipy": backends.ScipyDataStore,
+            "pydap": backends.PydapDataStore.open,
+            "h5netcdf": backends.H5NetCDFStore.open,
+            "pynio": backends.NioDataStore,
+            "pseudonetcdf": backends.PseudoNetCDFDataStore.open,
+            "cfgrib": backends.CfGribDataStore,
+        }
+        if engine in ["netcdf4", "h5netcdf"]:
+            extra_kwargs["group"] = group
+            extra_kwargs["lock"] = lock
+        elif engine in ["pynio", "pseudonetcdf", "cfgrib"]:
+            extra_kwargs["lock"] = lock
+        store = backend_switch.get(engine)(
+            filename_or_obj, **backend_kwargs, **extra_kwargs
+        )
 
     else:
         if engine not in [None, "scipy", "h5netcdf"]: