diff --git a/nestjs-BE/server/src/auth/auth.controller.ts b/nestjs-BE/server/src/auth/auth.controller.ts
index e512675e..d995fa96 100644
--- a/nestjs-BE/server/src/auth/auth.controller.ts
+++ b/nestjs-BE/server/src/auth/auth.controller.ts
@@ -45,7 +45,7 @@ export class AuthController {
     const userData = { email: kakaoUserAccount.email };
     const user = await this.usersService.getOrCreateUser(userData);
     const profileData = {
-      user_id: user.uuid,
+      userUuid: user.uuid,
       image: this.configService.get<string>('BASE_IMAGE_URL'),
       nickname: '익명의 사용자',
     };
diff --git a/nestjs-BE/server/src/auth/auth.service.spec.ts b/nestjs-BE/server/src/auth/auth.service.spec.ts
index ae307318..1455c03a 100644
--- a/nestjs-BE/server/src/auth/auth.service.spec.ts
+++ b/nestjs-BE/server/src/auth/auth.service.spec.ts
@@ -58,7 +58,7 @@ describe('AuthService', () => {
     jest.spyOn(jwtService, 'verify').mockReturnValue({});
     jest.spyOn(jwtService, 'signAsync').mockResolvedValue('access token');
     jest.spyOn(refreshTokensService, 'findRefreshToken').mockResolvedValue({
-      user_id: 'user uuid',
+      userUuid: 'user uuid',
     } as RefreshToken);
 
     const token = service.renewAccessToken('refresh token');
diff --git a/nestjs-BE/server/src/auth/refresh-tokens.service.spec.ts b/nestjs-BE/server/src/auth/refresh-tokens.service.spec.ts
index a5ae3277..ed3acd19 100644
--- a/nestjs-BE/server/src/auth/refresh-tokens.service.spec.ts
+++ b/nestjs-BE/server/src/auth/refresh-tokens.service.spec.ts
@@ -54,8 +54,8 @@ describe('RefreshTokensService', () => {
     const testToken = {
       id: 0,
       token: 'Token',
-      expiry_date: service.getExpiryDate(),
-      user_id: 'UserId',
+      expiryDate: service.getExpiryDate(),
+      userUuid: 'UserId',
     };
     jest.spyOn(prisma.refreshToken, 'findUnique').mockResolvedValue(testToken);
 
@@ -76,8 +76,8 @@ describe('RefreshTokensService', () => {
     const testToken = {
       id: 0,
       token: 'Token',
-      expiry_date: service.getExpiryDate(),
-      user_id: 'userId',
+      expiryDate: service.getExpiryDate(),
+      userUuid: 'userId',
     };
     jest.spyOn(prisma.refreshToken, 'create').mockResolvedValue(testToken);
 
@@ -105,8 +105,8 @@ describe('RefreshTokensService', () => {
     const testToken = {
       id: 0,
       token: 'Token',
-      expiry_date: service.getExpiryDate(),
-      user_id: 'userId',
+      expiryDate: service.getExpiryDate(),
+      userUuid: 'userId',
     };
     jest.spyOn(prisma.refreshToken, 'delete').mockResolvedValue(testToken);
 
diff --git a/nestjs-BE/server/src/auth/refresh-tokens.service.ts b/nestjs-BE/server/src/auth/refresh-tokens.service.ts
index 69bc7e7c..33295ac5 100644
--- a/nestjs-BE/server/src/auth/refresh-tokens.service.ts
+++ b/nestjs-BE/server/src/auth/refresh-tokens.service.ts
@@ -18,8 +18,8 @@ export class RefreshTokensService {
     return this.prisma.refreshToken.create({
       data: {
         token: this.createToken(),
-        expiry_date: this.getExpiryDate(),
-        user_id: userUuid,
+        expiryDate: this.getExpiryDate(),
+        userUuid,
       },
     });
   }
diff --git a/nestjs-BE/server/src/invite-codes/invite-codes.controller.ts b/nestjs-BE/server/src/invite-codes/invite-codes.controller.ts
index 85ba6d14..97059be9 100644
--- a/nestjs-BE/server/src/invite-codes/invite-codes.controller.ts
+++ b/nestjs-BE/server/src/invite-codes/invite-codes.controller.ts
@@ -44,7 +44,7 @@ export class InviteCodesController {
     return {
       statusCode: 201,
       message: 'Created',
-      data: { invite_code: inviteCode.invite_code },
+      data: { invite_code: inviteCode.inviteCode },
     };
   }
 
@@ -66,11 +66,11 @@ export class InviteCodesController {
     const inviteCodeData =
       await this.inviteCodesService.findInviteCode(inviteCode);
     if (!inviteCodeData) throw new NotFoundException();
-    if (this.inviteCodesService.checkExpiry(inviteCodeData.expiry_date)) {
+    if (this.inviteCodesService.checkExpiry(inviteCodeData.expiryDate)) {
       this.inviteCodesService.deleteInviteCode(inviteCode);
       throw new HttpException('Invite code has expired.', HttpStatus.GONE);
     }
-    const space = await this.spacesService.findSpace(inviteCodeData.space_uuid);
+    const space = await this.spacesService.findSpace(inviteCodeData.spaceUuid);
     return { statusCode: 200, message: 'Success', data: space };
   }
 }
diff --git a/nestjs-BE/server/src/invite-codes/invite-codes.service.ts b/nestjs-BE/server/src/invite-codes/invite-codes.service.ts
index cdd296bf..8c56b0b7 100644
--- a/nestjs-BE/server/src/invite-codes/invite-codes.service.ts
+++ b/nestjs-BE/server/src/invite-codes/invite-codes.service.ts
@@ -11,9 +11,9 @@ import generateUuid from '../utils/uuid';
 export class InviteCodesService {
   constructor(protected prisma: PrismaService) {}
 
-  async findInviteCode(inviteCode: string): Promise<InviteCode> {
+  async findInviteCode(inviteCode: string): Promise<InviteCode | null> {
     return this.prisma.inviteCode.findUnique({
-      where: { invite_code: inviteCode },
+      where: { inviteCode: inviteCode },
     });
   }
 
@@ -21,18 +21,18 @@ export class InviteCodesService {
     return this.prisma.inviteCode.create({
       data: {
         uuid: generateUuid(),
-        invite_code: await this.generateUniqueInviteCode(INVITE_CODE_LENGTH),
-        space_uuid: spaceUuid,
-        expiry_date: this.calculateExpiryDate(),
+        inviteCode: await this.generateUniqueInviteCode(INVITE_CODE_LENGTH),
+        spaceUuid: spaceUuid,
+        expiryDate: this.calculateExpiryDate(),
       },
     });
   }
 
-  async deleteInviteCode(inviteCode: string): Promise<InviteCode> {
+  async deleteInviteCode(inviteCode: string): Promise<InviteCode | null> {
     try {
       return await this.prisma.inviteCode.delete({
         where: {
-          invite_code: inviteCode,
+          inviteCode: inviteCode,
         },
       });
     } catch (err) {
@@ -70,7 +70,7 @@ export class InviteCodesService {
 
   private async generateUniqueInviteCode(length: number): Promise<string> {
     let inviteCode: string;
-    let inviteCodeData: InviteCode;
+    let inviteCodeData: InviteCode | null;
 
     do {
       inviteCode = this.generateShortInviteCode(length);
diff --git a/nestjs-BE/server/src/profiles/dto/create-profile.dto.ts b/nestjs-BE/server/src/profiles/dto/create-profile.dto.ts
index 9599e029..80f02831 100644
--- a/nestjs-BE/server/src/profiles/dto/create-profile.dto.ts
+++ b/nestjs-BE/server/src/profiles/dto/create-profile.dto.ts
@@ -3,7 +3,7 @@ import { MaxLength } from 'class-validator';
 import { MAX_NAME_LENGTH } from '../../config/magic-number';
 
 export class CreateProfileDto {
-  user_id: string;
+  userUuid: string;
 
   @ApiProperty({
     example: 'profile-image.png',
diff --git a/nestjs-BE/server/src/profiles/profiles.controller.spec.ts b/nestjs-BE/server/src/profiles/profiles.controller.spec.ts
index edcce612..d6d98613 100644
--- a/nestjs-BE/server/src/profiles/profiles.controller.spec.ts
+++ b/nestjs-BE/server/src/profiles/profiles.controller.spec.ts
@@ -31,7 +31,7 @@ describe('ProfilesController', () => {
     const requestMock = { user: { uuid: 'user test uuid' } } as RequestWithUser;
     const testProfile = {
       uuid: 'profile test uuid',
-      user_id: requestMock.user.uuid,
+      userUuid: requestMock.user.uuid,
       image: 'www.test.com/image',
       nickname: 'test nickname',
     };
@@ -67,7 +67,7 @@ describe('ProfilesController', () => {
     const testImageUrl = 'www.test.com/image';
     const testProfile = {
       uuid: 'profile test uuid',
-      user_id: requestMock.user.uuid,
+      userUuid: requestMock.user.uuid,
       image: 'www.test.com/image',
       nickname: 'test nickname',
     };
diff --git a/nestjs-BE/server/src/profiles/profiles.service.spec.ts b/nestjs-BE/server/src/profiles/profiles.service.spec.ts
index 8afc4e06..ae0f8b2c 100644
--- a/nestjs-BE/server/src/profiles/profiles.service.spec.ts
+++ b/nestjs-BE/server/src/profiles/profiles.service.spec.ts
@@ -34,7 +34,7 @@ describe('ProfilesService', () => {
     const userId = generateUuid();
     const testProfile = {
       uuid: generateUuid(),
-      user_id: userId,
+      userUuid: userId,
       image: 'www.test.com/image',
       nickname: 'test nickname',
     };
@@ -62,7 +62,7 @@ describe('ProfilesService', () => {
     const testProfiles = profileUuids.map((uuid, index) => {
       return {
         uuid,
-        user_id: generateUuid(),
+        userUuid: generateUuid(),
         image: 'www.test.com/image',
         nickname: `nickname${index}`,
       };
@@ -85,7 +85,7 @@ describe('ProfilesService', () => {
 
   it('getOrCreateProfile', async () => {
     const data = {
-      user_id: generateUuid(),
+      userUuid: generateUuid(),
       image: 'www.test.com/image',
       nickname: 'test nickname',
     };
@@ -103,7 +103,7 @@ describe('ProfilesService', () => {
       nickname: 'test nickname',
     };
     const uuid = generateUuid();
-    const testProfile = { uuid: generateUuid(), user_id: uuid, ...data };
+    const testProfile = { uuid: generateUuid(), userUuid: uuid, ...data };
     jest.spyOn(prisma.profile, 'update').mockResolvedValue(testProfile);
 
     const profile = profilesService.updateProfile(uuid, data);
diff --git a/nestjs-BE/server/src/profiles/profiles.service.ts b/nestjs-BE/server/src/profiles/profiles.service.ts
index 7a9eb676..a61a5905 100644
--- a/nestjs-BE/server/src/profiles/profiles.service.ts
+++ b/nestjs-BE/server/src/profiles/profiles.service.ts
@@ -25,11 +25,11 @@ export class ProfilesService {
 
   async getOrCreateProfile(data: CreateProfileDto): Promise<Profile> {
     return this.prisma.profile.upsert({
-      where: { userUuid: data.user_id },
+      where: { userUuid: data.userUuid },
       update: {},
       create: {
         uuid: generateUuid(),
-        userUuid: data.user_id,
+        userUuid: data.userUuid,
         image: data.image,
         nickname: data.nickname,
       },