diff --git a/backend/pyproject.toml b/backend/pyproject.toml
index 306f35180..c59b9dc0f 100644
--- a/backend/pyproject.toml
+++ b/backend/pyproject.toml
@@ -46,9 +46,9 @@ line-length = 120
 disable = ["missing-docstring", "line-too-long", "logging-fstring-interpolation", "duplicate-code"]
 extension-pkg-whitelist = "pydantic"
 ignored-modules = "pyarrow.compute"
-good-names = ["i", "x", "df"]
+good-names = ["i", "x", "df", "xy"]
 min-public-methods = 0
-max-args = 7
+max-args = 9
 max-locals = 19
 max-branches = 14
 
diff --git a/backend/src/backend/__init__.py b/backend/src/backend/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/backend/src/backend/primary/routers/correlations/router.py b/backend/src/backend/primary/routers/correlations/router.py
index 6d7404311..f474495b2 100644
--- a/backend/src/backend/primary/routers/correlations/router.py
+++ b/backend/src/backend/primary/routers/correlations/router.py
@@ -1,17 +1,6 @@
-import datetime
 import logging
-from typing import List
-
-from fastapi import APIRouter, Depends, Query
-
-from src.services.sumo_access.parameter_access import ParameterAccess
-from src.services.sumo_access.generic_types import EnsembleCorrelations
-from src.services.parameter_correlations import correlate_parameters_with_response
-from src.services.sumo_access.summary_access import SummaryAccess
-from src.services.sumo_access.inplace_volumetrics_access import InplaceVolumetricsAccess
-from src.services.utils.authenticated_user import AuthenticatedUser
-from src.backend.auth.auth_helper import AuthHelper
 
+from fastapi import APIRouter
 
 LOGGER = logging.getLogger(__name__)
 
diff --git a/backend/src/backend/primary/routers/general.py b/backend/src/backend/primary/routers/general.py
index 29e9c7f9f..5ec0687c5 100644
--- a/backend/src/backend/primary/routers/general.py
+++ b/backend/src/backend/primary/routers/general.py
@@ -41,7 +41,7 @@ def alive_protected() -> str:
 @router.get("/logged_in_user", response_model=UserInfo)
 async def logged_in_user(
     request: Request,
-    includeGraphApiInfo: bool = Query(
+    includeGraphApiInfo: bool = Query(  # pylint: disable=invalid-name
         False, description="Set to true to include user avatar and display name from Microsoft Graph API"
     ),
 ) -> UserInfo:
@@ -75,10 +75,10 @@ async def logged_in_user(
             user_info.avatar_b64str = avatar_b64str
             if graph_user_info is not None:
                 user_info.display_name = graph_user_info.get("displayName", None)
-        except httpx.HTTPError as e:
-            print("Error while fetching user avatar and info from Microsoft Graph API (HTTP error):\n", e)
-        except httpx.InvalidURL as e:
-            print("Error while fetching user avatar and info from Microsoft Graph API (Invalid URL):\n", e)
+        except httpx.HTTPError as exc:
+            print("Error while fetching user avatar and info from Microsoft Graph API (HTTP error):\n", exc)
+        except httpx.InvalidURL as exc:
+            print("Error while fetching user avatar and info from Microsoft Graph API (Invalid URL):\n", exc)
 
     return user_info
 
diff --git a/backend/src/backend/primary/routers/grid/router.py b/backend/src/backend/primary/routers/grid/router.py
index 8b658d34a..456cc25a1 100644
--- a/backend/src/backend/primary/routers/grid/router.py
+++ b/backend/src/backend/primary/routers/grid/router.py
@@ -1,8 +1,8 @@
-from fastapi import APIRouter, Depends
+from typing import List
+
+from fastapi import APIRouter, Depends, Query
 from starlette.requests import Request
-from typing import Any, List
 
-from fastapi import APIRouter, Depends, HTTPException, Query, Response
 from src.services.utils.authenticated_user import AuthenticatedUser
 from src.backend.auth.auth_helper import AuthHelper
 from src.backend.primary.user_session_proxy import proxy_to_user_session
@@ -68,7 +68,7 @@ async def grid_surface(
             "query_string": request.url.include_query_params(**query_params).query.encode("utf-8"),
             "headers": request.headers.raw,
         },
-        receive=request._receive,
+        receive=request._receive,  # pylint: disable=protected-access
     )
 
     response = await proxy_to_user_session(updated_request, authenticated_user)
@@ -104,7 +104,7 @@ async def grid_parameter(
             "query_string": request.url.include_query_params(**query_params).query.encode("utf-8"),
             "headers": request.headers.raw,
         },
-        receive=request._receive,
+        receive=request._receive,  # pylint: disable=protected-access
     )
 
     response = await proxy_to_user_session(updated_request, authenticated_user)
@@ -140,7 +140,7 @@ async def grid_parameter_intersection(
             "query_string": request.url.include_query_params(**query_params).query.encode("utf-8"),
             "headers": request.headers.raw,
         },
-        receive=request._receive,
+        receive=request._receive,  # pylint: disable=protected-access
     )
 
     response = await proxy_to_user_session(updated_request, authenticated_user)
@@ -176,7 +176,7 @@ async def statistical_grid_parameter_intersection(
             "query_string": request.url.include_query_params(**query_params).query.encode("utf-8"),
             "headers": request.headers.raw,
         },
-        receive=request._receive,
+        receive=request._receive,  # pylint: disable=protected-access
     )
 
     response = await proxy_to_user_session(updated_request, authenticated_user)
@@ -211,7 +211,7 @@ async def statistical_grid_parameter(
             "query_string": request.url.include_query_params(**query_params).query.encode("utf-8"),
             "headers": request.headers.raw,
         },
-        receive=request._receive,
+        receive=request._receive,  # pylint: disable=protected-access
     )
 
     response = await proxy_to_user_session(updated_request, authenticated_user)
diff --git a/backend/src/backend/primary/routers/pvt/converters.py b/backend/src/backend/primary/routers/pvt/converters.py
index 6206763ed..160cb9e6a 100644
--- a/backend/src/backend/primary/routers/pvt/converters.py
+++ b/backend/src/backend/primary/routers/pvt/converters.py
@@ -24,7 +24,7 @@ class PHASES(str, Enum):
 
 def pvt_dataframe_to_api_data(data_frame: pd.DataFrame) -> List[PvtData]:
     """Converts the PVT table from Sumo/Ecl2Df to a list of PvtData objects"""
-    """Dataframe manipulation is copied from webviz-subsurface"""
+    # Dataframe manipulation is copied from webviz-subsurface
 
     data_frame = data_frame.rename(str.upper, axis="columns").rename(
         columns={
@@ -51,13 +51,13 @@ def pvt_dataframe_to_api_data(data_frame: pd.DataFrame) -> List[PvtData]:
     list_of_pvtdata: List[PvtData] = []
 
     for keyword, df_grouped_on_keyword in data_frame.groupby("KEYWORD"):
-        if keyword in OIL_KEYWORDS.keys():
+        if keyword in OIL_KEYWORDS:
             phase = PHASES.OIL.value
             name = OIL_KEYWORDS[keyword]
-        elif keyword in GAS_KEYWORDS.keys():
+        elif keyword in GAS_KEYWORDS:
             phase = PHASES.GAS.value
             name = GAS_KEYWORDS[keyword]
-        elif keyword in WATER_KEYWORDS.keys():
+        elif keyword in WATER_KEYWORDS:
             phase = PHASES.WATER.value
             name = WATER_KEYWORDS[keyword]
         else:
diff --git a/backend/src/backend/primary/routers/pvt/router.py b/backend/src/backend/primary/routers/pvt/router.py
index 324c7cdbf..d68ea835b 100644
--- a/backend/src/backend/primary/routers/pvt/router.py
+++ b/backend/src/backend/primary/routers/pvt/router.py
@@ -1,8 +1,7 @@
 import logging
-from typing import List, Optional, Sequence, Union
+from typing import List
 
 from fastapi import APIRouter, Depends, HTTPException, Query
-from fastapi.responses import ORJSONResponse
 
 from src.backend.auth.auth_helper import AuthHelper
 from src.services.sumo_access.table_access import TableAccess
diff --git a/backend/src/backend/primary/routers/surface/converters.py b/backend/src/backend/primary/routers/surface/converters.py
index 6e813634a..591c15871 100644
--- a/backend/src/backend/primary/routers/surface/converters.py
+++ b/backend/src/backend/primary/routers/surface/converters.py
@@ -38,5 +38,5 @@ def to_api_surface_data(xtgeo_surf: xtgeo.RegularSurface) -> schemas.SurfaceData
         val_min=xtgeo_surf.values.min(),
         val_max=xtgeo_surf.values.max(),
         rot_deg=xtgeo_surf.rotation,
-        mesh_data=orjson.dumps(float32values).decode(),
+        mesh_data=orjson.dumps(float32values).decode(),  # pylint: disable=maybe-no-member
     )
diff --git a/backend/src/backend/primary/routers/well/router.py b/backend/src/backend/primary/routers/well/router.py
index c9601a5b1..a9ede000a 100644
--- a/backend/src/backend/primary/routers/well/router.py
+++ b/backend/src/backend/primary/routers/well/router.py
@@ -1,15 +1,11 @@
-import datetime
 import logging
-from typing import List, Optional, Sequence, Union
+from typing import List, Union
 
-import pyarrow as pa
-import pyarrow.compute as pc
-from fastapi import APIRouter, Depends, HTTPException, Query
+from fastapi import APIRouter, Depends, Query
 
 from src.services.smda_access import mocked_drogon_smda_access
 from src.services.smda_access.well_access import WellAccess
 from src.services.sumo_access.case_inspector import CaseInspector
-from src.services.smda_access.stratigraphy_access import StratigraphyAccess
 from src.services.utils.authenticated_user import AuthenticatedUser
 from src.backend.auth.auth_helper import AuthHelper
 
diff --git a/backend/src/backend/primary/user_session_proxy.py b/backend/src/backend/primary/user_session_proxy.py
index d0a00b654..e18eef06a 100644
--- a/backend/src/backend/primary/user_session_proxy.py
+++ b/backend/src/backend/primary/user_session_proxy.py
@@ -20,7 +20,7 @@ def __init__(self, name: str, port: int) -> None:
         self._name = name
         self._port = port
 
-        # TODO: This should be moved to Redis
+        # This should be moved to Redis - https://github.com/equinor/webviz/issues/357
         # key: user_id, value: name of Radix job instance
         self._existing_job_names: Dict[str, str] = {}
 
@@ -30,13 +30,13 @@ async def _active_running_job(self, user_id: str) -> bool:
         existing_job_name = self._existing_job_names.get(user_id)
         if not existing_job_name:
             return False
-        elif LOCALHOST_DEVELOPMENT:
+        if LOCALHOST_DEVELOPMENT:
             return True
 
         async with httpx.AsyncClient() as client:
-            r = await client.get(f"http://{self._name}:{self._port}/api/v1/jobs/{existing_job_name}")
+            res = await client.get(f"http://{self._name}:{self._port}/api/v1/jobs/{existing_job_name}")
 
-        job = r.json()
+        job = res.json()
 
         if job.get("status") != "Running" or not job.get("started"):
             return False
@@ -58,7 +58,7 @@ async def _create_new_job(self, user_id: str) -> None:
             self._existing_job_names[user_id] = self._name
         else:
             async with httpx.AsyncClient() as client:
-                r = await client.post(
+                res = await client.post(
                     f"http://{self._name}:{self._port}/api/v1/jobs",
                     # Maximum limits in "resources" for a Radix job is as of May 2023
                     # the specs of a single Standard_E16as_v4 node, i.e.:
@@ -75,7 +75,7 @@ async def _create_new_job(self, user_id: str) -> None:
                         }
                     },
                 )
-            self._existing_job_names[user_id] = r.json()["name"]
+            self._existing_job_names[user_id] = res.json()["name"]
 
             while not await self._active_running_job(user_id):
                 # It takes a couple of seconds before Radix job uvicorn process has
@@ -101,7 +101,9 @@ async def proxy_to_user_session(request: Request, authenticated_user: Authentica
     # Ideally this function should probably be a starlette/FastAPI middleware, but it appears that
     # it is not yet possible to put middleware on single routes through decorator like in express.js.
 
-    base_url = await RADIX_JOB_SCHEDULER_INSTANCE.get_base_url(authenticated_user._user_id)
+    base_url = await RADIX_JOB_SCHEDULER_INSTANCE.get_base_url(
+        authenticated_user._user_id  # pylint: disable=protected-access
+    )
 
     # See https://github.com/tiangolo/fastapi/discussions/7382:
 
diff --git a/backend/src/backend/user_session/routers/grid/router.py b/backend/src/backend/user_session/routers/grid/router.py
index 1313465eb..13e2b775d 100644
--- a/backend/src/backend/user_session/routers/grid/router.py
+++ b/backend/src/backend/user_session/routers/grid/router.py
@@ -3,17 +3,19 @@
 from functools import cache
 from typing import List, Tuple
 import logging
-import os, psutil
+import os
+from concurrent.futures import ThreadPoolExecutor
 
+import psutil
 import numpy as np
 import orjson
 import xtgeo
 from vtkmodules.util.numpy_support import vtk_to_numpy
-from fastapi import APIRouter, Depends, Request, Response
+from fastapi import APIRouter, Depends, Request
 from fastapi.responses import ORJSONResponse
+
 from src.backend.auth.auth_helper import AuthenticatedUser, AuthHelper
 from src.backend.primary.routers.grid.schemas import (
-    B64EncodedNumpyArray,
     GridSurface,
     GridIntersection,
 )
@@ -42,7 +44,6 @@ async def grid_surface(
     request: Request,
     authenticated_user: AuthenticatedUser = Depends(AuthHelper.get_authenticated_user),
 ):
-    """ """
     case_uuid = request.query_params.get("case_uuid")
     ensemble_name = request.query_params.get("ensemble_name")
     grid_name = request.query_params.get("grid_name")
@@ -61,11 +62,11 @@ async def grid_surface(
     grid_geometrics = xtgeo_grid.get_geometrics(allcells=True, return_dict=True)
 
     # Get grid surface (visible cells)
-    grid_surface = get_grid_surface(grid_geometry=xtgeo_grid)
+    grid_surface_instance = get_grid_surface(grid_geometry=xtgeo_grid)
 
     # Extract points and polygons from surface
-    points_np = vtk_to_numpy(grid_surface.polydata.GetPoints().GetData()).ravel().astype(np.float32)
-    polys_np = vtk_to_numpy(grid_surface.polydata.GetPolys().GetData()).astype(np.int64)
+    points_np = vtk_to_numpy(grid_surface_instance.polydata.GetPoints().GetData()).ravel().astype(np.float32)
+    polys_np = vtk_to_numpy(grid_surface_instance.polydata.GetPolys().GetData()).astype(np.int64)
 
     # Reduce precision of points to 2 decimals
     points_np = np.around(points_np, decimals=2)
@@ -86,7 +87,6 @@ async def grid_parameter(
     request: Request,
     authenticated_user: AuthenticatedUser = Depends(AuthHelper.get_authenticated_user),
 ):
-    """ """
     case_uuid = request.query_params.get("case_uuid")
     ensemble_name = request.query_params.get("ensemble_name")
     grid_name = request.query_params.get("grid_name")
@@ -129,11 +129,10 @@ async def grid_parameter(
     "/grid_parameter_intersection", response_model=List[float]
 )  # stating response_model here instead of return type apparently disables pydantic validation of the response (https://stackoverflow.com/a/65715205)
 # type: ignore
-async def grid_parameter(
+async def grid_parameter_intersection(  # pylint: disable=too-many-locals
     request: Request,
     authenticated_user: AuthenticatedUser = Depends(AuthHelper.get_authenticated_user),
 ):
-    """ """
     case_uuid = request.query_params.get("case_uuid")
     ensemble_name = request.query_params.get("ensemble_name")
     grid_name = request.query_params.get("grid_name")
@@ -230,7 +229,7 @@ async def grid_parameter(
 
     # Create the intersection data object
     intersection_data = GridIntersection(
-        image="data:image/png;base64,{}".format(image_data),
+        image=f"data:image/png;base64,{image_data}",
         polyline_x=polyline_x.tolist(),
         polyline_y=polyline_y.tolist(),
         x_min=float(x_min),
@@ -245,11 +244,10 @@ async def grid_parameter(
     "/statistical_grid_parameter_intersection", response_model=List[float]
 )  # stating response_model here instead of return type apparently disables pydantic validation of the response (https://stackoverflow.com/a/65715205)
 # type: ignore
-async def grid_parameter(
+async def statistical_grid_parameter_intersection(  # pylint: disable=too-many-locals
     request: Request,
     authenticated_user: AuthenticatedUser = Depends(AuthHelper.get_authenticated_user),
 ):
-    """ """
     timer = PerfTimer()
     print("#" * 80, flush=True)
     print("ENTERING STATISTICAL GRID PARAMETER INTERSECTION", flush=True)
@@ -264,7 +262,7 @@ async def grid_parameter(
     grid_name = request.query_params.get("grid_name")
     parameter_name = request.query_params.get("parameter_name")
     # convert json string of realizations into list
-    realizations = orjson.loads(request.query_params.get("realizations"))
+    realizations = orjson.loads(request.query_params.get("realizations"))  # pylint: disable=maybe-no-member
 
     grid_access = GridAccess(authenticated_user.get_sumo_access_token(), case_uuid, ensemble_name)
 
@@ -293,8 +291,6 @@ async def grid_parameter(
     print("GETTING GRID PARAMETERS", flush=True)
 
     ### Using ThreadPoolExecutor to parallelize the download of the grid parameters
-    from concurrent.futures import ThreadPoolExecutor
-
     def worker(real):
         return get_grid_parameter(
             authenticated_user=authenticated_user,
@@ -342,7 +338,7 @@ def worker(real):
     ]
 
     # Calculate the mean scalar value for each cell
-    values = np.nanmean([scalar_values for scalar_values in all_scalar_values], axis=0)
+    values = np.nanmean(all_scalar_values, axis=0)
 
     # Handle xtgeo undefined values and truncate
     values[values < np.nanmin(values)] = np.nanmin(values)
@@ -382,7 +378,7 @@ def worker(real):
 
     # Create the intersection data object
     intersection_data = GridIntersection(
-        image="data:image/png;base64,{}".format(image_data),
+        image=f"data:image/png;base64,{image_data}",
         polyline_x=polyline_x.tolist(),
         polyline_y=polyline_y.tolist(),
         x_min=float(x_min),
@@ -410,13 +406,12 @@ async def statistical_grid_parameter(
     request: Request,
     authenticated_user: AuthenticatedUser = Depends(AuthHelper.get_authenticated_user),
 ):
-    """ """
     case_uuid = request.query_params.get("case_uuid")
     ensemble_name = request.query_params.get("ensemble_name")
     grid_name = request.query_params.get("grid_name")
     parameter_name = request.query_params.get("parameter_name")
     # convert json string of realizations into list
-    realizations = orjson.loads(request.query_params.get("realizations"))
+    realizations = orjson.loads(request.query_params.get("realizations"))  # pylint: disable=maybe-no-member
 
     grid_access = GridAccess(authenticated_user.get_sumo_access_token(), case_uuid, ensemble_name)
 
@@ -456,7 +451,7 @@ async def statistical_grid_parameter(
     ]
 
     # Calculate the mean scalar values for each cell
-    mean_scalar_values = np.nanmean([scalar_values for scalar_values in all_scalar_values], axis=0)
+    mean_scalar_values = np.nanmean(all_scalar_values, axis=0)
 
     # Handle xtgeo undefined values and truncate
     mean_scalar_values[mean_scalar_values == -999.0] = np.nan
@@ -484,9 +479,7 @@ def get_grid_geometry(
 
 @cache
 def get_grid_surface(grid_geometry: xtgeo.Grid) -> VtkGridSurface:
-    grid_surface = get_surface(grid_geometry)
-
-    return grid_surface
+    return get_surface(grid_geometry)
 
 
 @cache
@@ -501,9 +494,7 @@ def get_grid_parameter(
     token = authenticated_user.get_sumo_access_token()
     grid_access = GridAccess(token, case_uuid, ensemble_name)
 
-    grid_parameter = grid_access.get_grid_parameter(grid_name, parameter_name, int(realization))
-
-    return grid_parameter
+    return grid_access.get_grid_parameter(grid_name, parameter_name, int(realization))
 
 
 @cache