diff --git a/api/src/app.controller.spec.ts b/api/src/app.controller.spec.ts
deleted file mode 100644
index 3e6017d..0000000
--- a/api/src/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 appController: AppController
-
-  beforeEach(async () => {
-    const app: TestingModule = await Test.createTestingModule({
-      controllers: [AppController],
-      providers: [AppService],
-    }).compile()
-
-    appController = app.get<AppController>(AppController)
-  })
-
-  describe('root', () => {
-    it('should return "Hello World!"', () => {
-      expect(appController.getHello()).toBe('Hello World!')
-    })
-  })
-})
diff --git a/api/src/app.controller.ts b/api/src/app.controller.ts
deleted file mode 100644
index b7599df..0000000
--- a/api/src/app.controller.ts
+++ /dev/null
@@ -1,5 +0,0 @@
-import { Controller, Get } from '@nestjs/common'
-import { AppService } from './app.service'
-
-@Controller()
-export class AppController {}
diff --git a/api/src/app.module.ts b/api/src/app.module.ts
index 6d28ac3..a53f3e9 100644
--- a/api/src/app.module.ts
+++ b/api/src/app.module.ts
@@ -1,6 +1,4 @@
 import { Module } from '@nestjs/common'
-import { AppController } from './app.controller'
-import { AppService } from './app.service'
 import { MongooseModule } from '@nestjs/mongoose'
 import { GatewayModule } from './gateway/gateway.module'
 import { AuthModule } from './auth/auth.module'
@@ -13,7 +11,7 @@ import { UsersModule } from './users/users.module'
     UsersModule,
     GatewayModule,
   ],
-  controllers: [AppController],
-  providers: [AppService],
+  controllers: [],
+  providers: [],
 })
 export class AppModule {}
diff --git a/api/src/app.service.ts b/api/src/app.service.ts
deleted file mode 100644
index 5965cb5..0000000
--- a/api/src/app.service.ts
+++ /dev/null
@@ -1,4 +0,0 @@
-import { Injectable } from '@nestjs/common'
-
-@Injectable()
-export class AppService {}
diff --git a/api/src/auth/auth.module.ts b/api/src/auth/auth.module.ts
index a381b3d..97cbdbc 100644
--- a/api/src/auth/auth.module.ts
+++ b/api/src/auth/auth.module.ts
@@ -2,7 +2,7 @@ import { Module } from '@nestjs/common'
 import { JwtModule } from '@nestjs/jwt'
 import { MongooseModule } from '@nestjs/mongoose'
 import { PassportModule } from '@nestjs/passport'
-import { UsersModule } from 'src/users/users.module'
+import { UsersModule } from '../users/users.module'
 import { AuthController } from './auth.controller'
 import { AuthService } from './auth.service'
 import { JwtStrategy } from './jwt.strategy'
diff --git a/api/src/auth/auth.service.ts b/api/src/auth/auth.service.ts
index f9bd127..fea157f 100644
--- a/api/src/auth/auth.service.ts
+++ b/api/src/auth/auth.service.ts
@@ -1,12 +1,12 @@
 import { HttpException, HttpStatus, Injectable } from '@nestjs/common'
-import { UsersService } from 'src/users/users.service'
+import { UsersService } from '../users/users.service'
 import { JwtService } from '@nestjs/jwt'
 import * as bcrypt from 'bcryptjs'
 import { v4 as uuidv4 } from 'uuid'
 import { InjectModel } from '@nestjs/mongoose'
 import { ApiKey, ApiKeyDocument } from './schemas/api-key.schema'
 import { Model } from 'mongoose'
-import { User } from 'src/users/schemas/user.schema'
+import { User } from '../users/schemas/user.schema'
 import axios from 'axios'
 @Injectable()
 export class AuthService {
diff --git a/api/src/auth/guards/auth.guard.ts b/api/src/auth/guards/auth.guard.ts
index 5c929fe..4ab5a34 100644
--- a/api/src/auth/guards/auth.guard.ts
+++ b/api/src/auth/guards/auth.guard.ts
@@ -6,7 +6,7 @@ import {
   Injectable,
 } from '@nestjs/common'
 import { JwtService } from '@nestjs/jwt'
-import { UsersService } from 'src/users/users.service'
+import { UsersService } from '../../users/users.service'
 import { AuthService } from '../auth.service'
 import * as bcrypt from 'bcryptjs'
 
@@ -32,15 +32,13 @@ export class AuthGuard implements CanActivate {
     // check apiKey in query params
     else if (request.query.apiKey) {
       const apiKeyStr = request.query.apiKey
-      if (apiKeyStr) {
-        var regex = new RegExp(`^${apiKeyStr.substr(0, 17)}`, 'g')
-        const apiKey = await this.authService.findApiKey({
-          apiKey: { $regex: regex },
-        })
+      const regex = new RegExp(`^${apiKeyStr.substr(0, 17)}`, 'g')
+      const apiKey = await this.authService.findApiKey({
+        apiKey: { $regex: regex },
+      })
 
-        if (apiKey && bcrypt.compareSync(apiKeyStr, apiKey.hashedApiKey)) {
-          userId = apiKey.user
-        }
+      if (apiKey && bcrypt.compareSync(apiKeyStr, apiKey.hashedApiKey)) {
+        userId = apiKey.user
       }
     }
 
diff --git a/api/src/auth/guards/can-modify-api-key.guard.ts b/api/src/auth/guards/can-modify-api-key.guard.ts
index a6be522..bef09ca 100644
--- a/api/src/auth/guards/can-modify-api-key.guard.ts
+++ b/api/src/auth/guards/can-modify-api-key.guard.ts
@@ -6,7 +6,7 @@ import {
   Injectable,
 } from '@nestjs/common'
 import mongoose from 'mongoose'
-import { UserRole } from 'src/users/user-roles.enum'
+import { UserRole } from '../../users/user-roles.enum'
 import { AuthService } from '../auth.service'
 
 @Injectable()
diff --git a/api/src/auth/jwt.strategy.ts b/api/src/auth/jwt.strategy.ts
index 5b5c5d4..b4d91ca 100644
--- a/api/src/auth/jwt.strategy.ts
+++ b/api/src/auth/jwt.strategy.ts
@@ -1,8 +1,8 @@
 import { ExtractJwt, Strategy } from 'passport-jwt'
 import { PassportStrategy } from '@nestjs/passport'
 import { HttpException, HttpStatus, Injectable } from '@nestjs/common'
-import { UsersService } from 'src/users/users.service'
-import { User } from 'src/users/schemas/user.schema'
+import { UsersService } from '../users/users.service'
+import { User } from '../users/schemas/user.schema'
 
 @Injectable()
 export class JwtStrategy extends PassportStrategy(Strategy) {
@@ -19,8 +19,7 @@ export class JwtStrategy extends PassportStrategy(Strategy) {
     const user = await this.usersService.findOne({ _id: userId })
     if (!user) {
       throw new HttpException('Unauthorized', HttpStatus.UNAUTHORIZED)
-    } else {
-      return user
     }
+    return user
   }
 }
diff --git a/api/src/auth/schemas/api-key.schema.ts b/api/src/auth/schemas/api-key.schema.ts
index 11587fb..7a1d54a 100644
--- a/api/src/auth/schemas/api-key.schema.ts
+++ b/api/src/auth/schemas/api-key.schema.ts
@@ -1,6 +1,6 @@
 import { Prop, Schema, SchemaFactory } from '@nestjs/mongoose'
 import { Document, Types } from 'mongoose'
-import { User } from 'src/users/schemas/user.schema'
+import { User } from '../../users/schemas/user.schema'
 
 export type ApiKeyDocument = ApiKey & Document
 
diff --git a/api/src/gateway/gateway.controller.ts b/api/src/gateway/gateway.controller.ts
index 75288c4..8ebd198 100644
--- a/api/src/gateway/gateway.controller.ts
+++ b/api/src/gateway/gateway.controller.ts
@@ -9,7 +9,7 @@ import {
   Get,
 } from '@nestjs/common'
 import { ApiBearerAuth, ApiOperation, ApiQuery, ApiTags } from '@nestjs/swagger'
-import { AuthGuard } from 'src/auth/guards/auth.guard'
+import { AuthGuard } from '../auth/guards/auth.guard'
 import { RegisterDeviceInputDTO, SendSMSInputDTO } from './gateway.dto'
 import { GatewayService } from './gateway.service'
 import { CanModifyDevice } from './guards/can-modify-device.guard'
diff --git a/api/src/gateway/gateway.module.ts b/api/src/gateway/gateway.module.ts
index aeb6e83..34052d6 100644
--- a/api/src/gateway/gateway.module.ts
+++ b/api/src/gateway/gateway.module.ts
@@ -3,8 +3,8 @@ import { MongooseModule } from '@nestjs/mongoose'
 import { Device, DeviceSchema } from './schemas/device.schema'
 import { GatewayController } from './gateway.controller'
 import { GatewayService } from './gateway.service'
-import { AuthModule } from 'src/auth/auth.module'
-import { UsersModule } from 'src/users/users.module'
+import { AuthModule } from '../auth/auth.module'
+import { UsersModule } from '../users/users.module'
 
 @Module({
   imports: [
diff --git a/api/src/gateway/gateway.service.spec.ts b/api/src/gateway/gateway.service.spec.ts
index c11d1b8..d6a1886 100644
--- a/api/src/gateway/gateway.service.spec.ts
+++ b/api/src/gateway/gateway.service.spec.ts
@@ -1,5 +1,6 @@
 import { Test, TestingModule } from '@nestjs/testing'
 import { GatewayService } from './gateway.service'
+import { AuthModule } from '../auth/auth.module'
 
 describe('GatewayService', () => {
   let service: GatewayService
@@ -7,6 +8,7 @@ describe('GatewayService', () => {
   beforeEach(async () => {
     const module: TestingModule = await Test.createTestingModule({
       providers: [GatewayService],
+      imports: [AuthModule],
     }).compile()
 
     service = module.get<GatewayService>(GatewayService)
diff --git a/api/src/gateway/gateway.service.ts b/api/src/gateway/gateway.service.ts
index bcbe1c0..6771de3 100644
--- a/api/src/gateway/gateway.service.ts
+++ b/api/src/gateway/gateway.service.ts
@@ -4,7 +4,7 @@ import { Device, DeviceDocument } from './schemas/device.schema'
 import { Model } from 'mongoose'
 import * as firebaseAdmin from 'firebase-admin'
 import { RegisterDeviceInputDTO, SendSMSInputDTO } from './gateway.dto'
-import { User } from 'src/users/schemas/user.schema'
+import { User } from '../users/schemas/user.schema'
 @Injectable()
 export class GatewayService {
   constructor(
diff --git a/api/src/gateway/guards/can-modify-device.guard.ts b/api/src/gateway/guards/can-modify-device.guard.ts
index ec489bd..65f8c15 100644
--- a/api/src/gateway/guards/can-modify-device.guard.ts
+++ b/api/src/gateway/guards/can-modify-device.guard.ts
@@ -6,7 +6,7 @@ import {
   Injectable,
 } from '@nestjs/common'
 import mongoose from 'mongoose'
-import { UserRole } from 'src/users/user-roles.enum'
+import { UserRole } from '../../users/user-roles.enum'
 import { GatewayService } from '../gateway.service'
 
 @Injectable()
diff --git a/api/src/gateway/schemas/device.schema.ts b/api/src/gateway/schemas/device.schema.ts
index f047bfe..ca5626f 100644
--- a/api/src/gateway/schemas/device.schema.ts
+++ b/api/src/gateway/schemas/device.schema.ts
@@ -1,6 +1,6 @@
 import { Prop, Schema, SchemaFactory } from '@nestjs/mongoose'
 import { Document, Types } from 'mongoose'
-import { User } from 'src/users/schemas/user.schema'
+import { User } from '../../users/schemas/user.schema'
 
 export type DeviceDocument = Device & Document
 
diff --git a/api/src/gateway/schemas/sms.schema.ts b/api/src/gateway/schemas/sms.schema.ts
index 18b4eb5..98772ee 100644
--- a/api/src/gateway/schemas/sms.schema.ts
+++ b/api/src/gateway/schemas/sms.schema.ts
@@ -1,7 +1,5 @@
 import { Prop, Schema, SchemaFactory } from '@nestjs/mongoose'
 import { Document, Types } from 'mongoose'
-import { ApiKey } from 'src/auth/schemas/api-key.schema'
-import { User } from 'src/users/schemas/user.schema'
 import { Device } from './device.schema'
 
 export type SMSDocument = SMS & Document