diff --git a/packages/backend/.eslintrc.js b/packages/backend/.eslintrc.js
new file mode 100644
index 00000000..395cd7c2
--- /dev/null
+++ b/packages/backend/.eslintrc.js
@@ -0,0 +1,28 @@
+module.exports = {
+  root: true,
+  env: {
+    node: true,
+  },
+  parser: '@typescript-eslint/parser',
+  plugins: ['@typescript-eslint'],
+  extends: [
+    'eslint:recommended',
+    'plugin:@typescript-eslint/recommended',
+    'prettier',
+  ],
+  overrides: [
+    {
+      files: ['**/*.test.ts', '**/test/**/*.ts'],
+      rules: {
+        '@typescript-eslint/ban-ts-comment': ['off'],
+        '@typescript-eslint/no-explicit-any': ['off'],
+      },
+    },
+    {
+      files: ['**/*.ts'],
+      rules: {
+        '@typescript-eslint/no-explicit-any': ['off'],
+      },
+    },
+  ],
+};
diff --git a/packages/backend/src/config/app.ts b/packages/backend/src/config/app.js
similarity index 75%
rename from packages/backend/src/config/app.ts
rename to packages/backend/src/config/app.js
index 24ff5663..15397bf8 100644
--- a/packages/backend/src/config/app.ts
+++ b/packages/backend/src/config/app.js
@@ -1,6 +1,7 @@
 import { URL } from 'node:url';
 import * as dotenv from 'dotenv';
 import path from 'path';
+import process from 'node:process';
 
 if (process.env.APP_ENV === 'test') {
   dotenv.config({ path: path.resolve(__dirname, '../../.env.test') });
@@ -8,57 +9,6 @@ if (process.env.APP_ENV === 'test') {
   dotenv.config();
 }
 
-type AppConfig = {
-  host: string;
-  protocol: string;
-  port: string;
-  webAppUrl: string;
-  webhookUrl: string;
-  appEnv: string;
-  logLevel: string;
-  isDev: boolean;
-  isTest: boolean;
-  isProd: boolean;
-  postgresDatabase: string;
-  postgresSchema: string;
-  postgresPort: number;
-  postgresHost: string;
-  postgresUsername: string;
-  postgresPassword?: string;
-  version: string;
-  postgresEnableSsl: boolean;
-  baseUrl: string;
-  encryptionKey: string;
-  webhookSecretKey: string;
-  appSecretKey: string;
-  serveWebAppSeparately: boolean;
-  redisHost: string;
-  redisPort: number;
-  redisUsername: string;
-  redisPassword: string;
-  redisTls: boolean;
-  enableBullMQDashboard: boolean;
-  bullMQDashboardUsername: string;
-  bullMQDashboardPassword: string;
-  telemetryEnabled: boolean;
-  requestBodySizeLimit: string;
-  smtpHost: string;
-  smtpPort: number;
-  smtpSecure: boolean;
-  smtpUser: string;
-  smtpPassword: string;
-  fromEmail: string;
-  isCloud: boolean;
-  isMation: boolean;
-  isSelfHosted: boolean;
-  paddleVendorId: number;
-  paddleVendorAuthCode: string;
-  paddlePublicKey: string;
-  licenseKey: string;
-  sentryDsn: string;
-  CI: boolean;
-};
-
 const host = process.env.HOST || 'localhost';
 const protocol = process.env.PROTOCOL || 'http';
 const port = process.env.PORT || '3000';
@@ -85,7 +35,7 @@ webhookUrl = webhookUrl.substring(0, webhookUrl.length - 1);
 
 const appEnv = process.env.APP_ENV || 'development';
 
-const appConfig: AppConfig = {
+const appConfig = {
   host,
   protocol,
   port,
diff --git a/packages/backend/src/config/cors-options.ts b/packages/backend/src/config/cors-options.js
similarity index 100%
rename from packages/backend/src/config/cors-options.ts
rename to packages/backend/src/config/cors-options.js
diff --git a/packages/backend/src/config/database.ts b/packages/backend/src/config/database.js
similarity index 88%
rename from packages/backend/src/config/database.ts
rename to packages/backend/src/config/database.js
index 4f8c061b..f6b15e61 100644
--- a/packages/backend/src/config/database.ts
+++ b/packages/backend/src/config/database.js
@@ -4,11 +4,10 @@ import process from 'process';
 import pg from 'pg';
 pg.types.setTypeParser(20, 'text', parseInt);
 import knex from 'knex';
-import type { Knex } from 'knex';
 import knexConfig from '../../knexfile';
 import logger from '../helpers/logger';
 
-export const client: Knex = knex(knexConfig);
+export const client = knex(knexConfig);
 
 const CONNECTION_REFUSED = 'ECONNREFUSED';
 
diff --git a/packages/backend/src/config/orm.ts b/packages/backend/src/config/orm.js
similarity index 100%
rename from packages/backend/src/config/orm.ts
rename to packages/backend/src/config/orm.js
diff --git a/packages/backend/src/config/redis.ts b/packages/backend/src/config/redis.js
similarity index 57%
rename from packages/backend/src/config/redis.ts
rename to packages/backend/src/config/redis.js
index ea56ccd8..4371b911 100644
--- a/packages/backend/src/config/redis.ts
+++ b/packages/backend/src/config/redis.js
@@ -1,16 +1,6 @@
 import appConfig from './app';
 
-type TRedisConfig = {
-  host: string,
-  port: number,
-  username?: string,
-  password?: string,
-  tls?: Record<string, unknown>,
-  enableReadyCheck?: boolean,
-  enableOfflineQueue: boolean,
-}
-
-const redisConfig: TRedisConfig = {
+const redisConfig = {
   host: appConfig.redisHost,
   port: appConfig.redisPort,
   username: appConfig.redisUsername,