diff --git a/package-lock.json b/package-lock.json
index bfd6179..a3d3864 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -17,11 +17,13 @@
         "@nestjs/platform-express": "^11.0.1",
         "@nestjs/schedule": "^6.1.1",
         "@nestjs/swagger": "^11.2.6",
+        "@nestjs/throttler": "^6.5.0",
         "@nestjs/typeorm": "^11.0.0",
         "bcrypt": "^6.0.0",
         "class-transformer": "^0.5.1",
         "class-validator": "^0.14.3",
         "dotenv": "^17.4.2",
+        "helmet": "^8.2.0",
         "ioredis": "^5.10.1",
         "joi": "^18.0.2",
         "nestjs-i18n": "^10.6.0",
@@ -2538,6 +2540,17 @@
         }
       }
     },
+    "node_modules/@nestjs/throttler": {
+      "version": "6.5.0",
+      "resolved": "https://registry.npmjs.org/@nestjs/throttler/-/throttler-6.5.0.tgz",
+      "integrity": "sha512-9j0ZRfH0QE1qyrj9JjIRDz5gQLPqq9yVC2nHsrosDVAfI5HHw08/aUAWx9DZLSdQf4HDkmhTTEGLrRFHENvchQ==",
+      "license": "MIT",
+      "peerDependencies": {
+        "@nestjs/common": "^7.0.0 || ^8.0.0 || ^9.0.0 || ^10.0.0 || ^11.0.0",
+        "@nestjs/core": "^7.0.0 || ^8.0.0 || ^9.0.0 || ^10.0.0 || ^11.0.0",
+        "reflect-metadata": "^0.1.13 || ^0.2.0"
+      }
+    },
     "node_modules/@nestjs/typeorm": {
       "version": "11.0.0",
       "resolved": "https://registry.npmjs.org/@nestjs/typeorm/-/typeorm-11.0.0.tgz",
@@ -6091,6 +6104,18 @@
         "node": ">= 0.4"
       }
     },
+    "node_modules/helmet": {
+      "version": "8.2.0",
+      "resolved": "https://registry.npmjs.org/helmet/-/helmet-8.2.0.tgz",
+      "integrity": "sha512-DRgTIUgnWcJ62KyarxxziuqYxKGnR6Rgg19BlbucN/dpmJbl1XOit6qvoOX0ZT+HhWe5OUVhU/a1zpGyc1xA0Q==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=18.0.0"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/EvanHahn"
+      }
+    },
     "node_modules/html-escaper": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/html-escaper/-/html-escaper-2.0.2.tgz",
diff --git a/package.json b/package.json
index 24cd593..3160d07 100644
--- a/package.json
+++ b/package.json
@@ -28,11 +28,13 @@
     "@nestjs/platform-express": "^11.0.1",
     "@nestjs/schedule": "^6.1.1",
     "@nestjs/swagger": "^11.2.6",
+    "@nestjs/throttler": "^6.5.0",
     "@nestjs/typeorm": "^11.0.0",
     "bcrypt": "^6.0.0",
     "class-transformer": "^0.5.1",
     "class-validator": "^0.14.3",
     "dotenv": "^17.4.2",
+    "helmet": "^8.2.0",
     "ioredis": "^5.10.1",
     "joi": "^18.0.2",
     "nestjs-i18n": "^10.6.0",
diff --git a/src/app.module.ts b/src/app.module.ts
index 9c60e00..b1b5433 100644
--- a/src/app.module.ts
+++ b/src/app.module.ts
@@ -13,7 +13,7 @@ import { RedisModule } from './common/modules/redis/redis.module';
 import path from 'path';
 import jwtConfig from './config/jwt.config';
 import redisConfig from './config/redis.config';
-import { APP_FILTER } from '@nestjs/core';
+import { APP_FILTER, APP_GUARD } from '@nestjs/core';
 import { GlobalExceptionFilter } from './common/filters/global-exception.filter';
 import { ScheduleModule } from '@nestjs/schedule';
 import { TestsModule } from './modules/tests/tests.module';
@@ -21,6 +21,8 @@ import { QuestionsModule } from './modules/questions/questions.module';
 import { SubmissionsModule } from './modules/submissions/submissions.module';
 import { ScoringModule } from './modules/scoring/scoring.module';
 import { AdminModule } from './modules/admin/admin.module';
+import { ThrottlerModule } from '@nestjs/throttler';
+import { AppThrottlerGuard } from './common/guards/app-throttler.guard';
 
 const ENV = process.env.NODE_ENV;
 
@@ -68,6 +70,14 @@ const ENV = process.env.NODE_ENV;
     // Schedule
     ScheduleModule.forRoot(),
 
+    // Throttler
+    ThrottlerModule.forRoot([
+      { name: 'default', limit: 100, ttl: 60_000 },
+      { name: 'login', limit: 5, ttl: 60_000 },
+      { name: 'otp', limit: 3, ttl: 300_000 },
+      { name: 'admin', limit: 30, ttl: 60_000 },
+    ]),
+
     /**
      * Local Modules
      */
@@ -87,6 +97,10 @@ const ENV = process.env.NODE_ENV;
       provide: APP_FILTER,
       useClass: GlobalExceptionFilter,
     },
+    {
+      provide: APP_GUARD,
+      useClass: AppThrottlerGuard,
+    },
   ],
 })
 export class AppModule {}
diff --git a/src/common/guards/app-throttler.guard.ts b/src/common/guards/app-throttler.guard.ts
new file mode 100644
index 0000000..caf9a58
--- /dev/null
+++ b/src/common/guards/app-throttler.guard.ts
@@ -0,0 +1,13 @@
+import { HttpStatus } from '@nestjs/common';
+import { ThrottlerGuard } from '@nestjs/throttler';
+import { AppException } from '../exceptions/app.exception';
+
+export class AppThrottlerGuard extends ThrottlerGuard {
+  protected throwThrottlingException(): Promise<void> {
+    throw new AppException(
+      'common.errors.tooManyRequests',
+      HttpStatus.TOO_MANY_REQUESTS,
+      { minutes: 1 },
+    );
+  }
+}
diff --git a/src/main.ts b/src/main.ts
index b87fa41..1f18497 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -3,6 +3,7 @@ import { AppModule } from './app.module';
 import { I18nValidationExceptionFilter, I18nValidationPipe } from 'nestjs-i18n';
 import { SwaggerModule, DocumentBuilder } from '@nestjs/swagger';
 import { ResponseInterceptor } from './common/interceptors/response.interceptor';
+import helmet from 'helmet';
 
 async function bootstrap() {
   const app = await NestFactory.create(AppModule);
@@ -36,6 +37,8 @@ async function bootstrap() {
     credentials: true,
   });
 
+  app.use(helmet());
+
   const config = new DocumentBuilder()
     .setTitle('Borna API')
     .setDescription('Borna API Documentation')