diff --git a/apps/backend/src/app/app.controller.spec.ts b/apps/backend/src/app/app.controller.spec.ts
deleted file mode 100644
index f020712..0000000
--- a/apps/backend/src/app/app.controller.spec.ts
+++ /dev/null
@@ -1,22 +0,0 @@
-import { Test, TestingModule } from "@nestjs/testing";
-
-import { AppController } from "./app.controller";
-import { AppService } from "./app.service";
-
-describe("AppController", () => {
-	let app: TestingModule;
-
-	beforeAll(async () => {
-		app = await Test.createTestingModule({
-			controllers: [AppController],
-			providers: [AppService],
-		}).compile();
-	});
-
-	describe("getData", () => {
-		it('should return "Hello API"', () => {
-			const appController = app.get<AppController>(AppController);
-			expect(appController.getData()).toEqual({ message: "Hello API" });
-		});
-	});
-});
diff --git a/apps/backend/src/app/app.module.ts b/apps/backend/src/app/app.module.ts
index 4afa69d..903c82e 100644
--- a/apps/backend/src/app/app.module.ts
+++ b/apps/backend/src/app/app.module.ts
@@ -1,12 +1,29 @@
-import { Module } from "@nestjs/common";
+import { Module } from '@nestjs/common';
 
-import { AppController } from "./app.controller";
-import { AppService } from "./app.service";
-import { DbModule } from "./db/db.module";
+import { AppController } from './app.controller';
+import { AppService } from './app.service';
+import { DbModule } from './db/db.module';
+import { ThrottlerModule } from '@nestjs/throttler';
+import { ConfigModule } from '@nestjs/config';
+import { AuthModule } from './auth/auth.module';
+import { CredentialsModule } from './credentials/credentials.module';
 
 @Module({
-	imports: [DbModule],
-	controllers: [AppController],
-	providers: [AppService],
+  imports: [
+    ThrottlerModule.forRoot([
+      {
+        ttl: 60000,
+        limit: 10,
+      },
+    ]),
+    ConfigModule.forRoot({
+      isGlobal: true,
+    }),
+    DbModule,
+    AuthModule,
+    CredentialsModule,
+  ],
+  controllers: [AppController],
+  providers: [AppService],
 })
 export class AppModule {}
diff --git a/apps/backend/src/app/app.service.spec.ts b/apps/backend/src/app/app.service.spec.ts
deleted file mode 100644
index 3918cbf..0000000
--- a/apps/backend/src/app/app.service.spec.ts
+++ /dev/null
@@ -1,21 +0,0 @@
-import { Test } from "@nestjs/testing";
-
-import { AppService } from "./app.service";
-
-describe("AppService", () => {
-	let service: AppService;
-
-	beforeAll(async () => {
-		const app = await Test.createTestingModule({
-			providers: [AppService],
-		}).compile();
-
-		service = app.get<AppService>(AppService);
-	});
-
-	describe("getData", () => {
-		it('should return "Hello API"', () => {
-			expect(service.getData()).toEqual({ message: "Hello API" });
-		});
-	});
-});
diff --git a/apps/backend/src/app/app.service.ts b/apps/backend/src/app/app.service.ts
index 6643ef5..a201571 100644
--- a/apps/backend/src/app/app.service.ts
+++ b/apps/backend/src/app/app.service.ts
@@ -2,11 +2,7 @@ import { Injectable } from "@nestjs/common";
 
 @Injectable()
 export class AppService {
-	getData(): { message: string } {
-		return { message: "Hello API" };
+	getData(): { registration: boolean } {
+		return { registration: false };
 	}
 }
-
-const hello: object = {
-	name: "ABC",
-};
diff --git a/apps/backend/src/main.ts b/apps/backend/src/main.ts
index cb835f2..e3bb581 100644
--- a/apps/backend/src/main.ts
+++ b/apps/backend/src/main.ts
@@ -6,12 +6,14 @@
 import { Logger } from "@nestjs/common";
 import { NestFactory } from "@nestjs/core";
 
+import helmet from "helmet";
 import { AppModule } from "./app/app.module";
 
 async function bootstrap() {
 	const app = await NestFactory.create(AppModule);
 	const globalPrefix = "api";
 	app.setGlobalPrefix(globalPrefix);
+	app.use(helmet());
 	const port = process.env.PORT || 3000;
 	await app.listen(port);
 	Logger.log(