diff --git a/backend/src/modules/auth-module/services/token-management.service.ts b/backend/src/modules/auth-module/services/token-management.service.ts
index a7136c6..73ad211 100644
--- a/backend/src/modules/auth-module/services/token-management.service.ts
+++ b/backend/src/modules/auth-module/services/token-management.service.ts
@@ -5,33 +5,54 @@ import { JwtService } from '@nestjs/jwt';
 
 @Injectable()
 export class TokenManagementService {
-
-  private readonly ACCESS_TOKEN_EXPIRY = '15m';
-  private readonly REFRESH_TOKEN_EXPIRY = '7d';
+  private readonly ACCESS_TOKEN_EXPIRY: string;
+  private readonly REFRESH_TOKEN_EXPIRY: string;
+  private readonly JWT_SECRET_AT: string;
+  private readonly JWT_SECRET_RT: string;
 
   constructor(
     private readonly jwt: JwtService,
     private readonly configService: ConfigService
-  ) {}
+  ) {
+    this.ACCESS_TOKEN_EXPIRY = this.configService.get<string>(
+      'ACCESS_TOKEN_EXPIRY'
+    );
+    this.REFRESH_TOKEN_EXPIRY = this.configService.get<string>(
+      'REFRESH_TOKEN_EXPIRY'
+    );
+    this.JWT_SECRET_AT = this.configService.get<string>('JWT_SECRET_AT');
+    this.JWT_SECRET_RT = this.configService.get<string>('JWT_SECRET_RT');
+  }
 
   public async generateTokens(userId: number, email: string): Promise<Tokens> {
-    const [access_token, refresh_token] = await Promise.all([
-      this.jwt.signAsync(
-        { sub: userId, email },
-        {
-          expiresIn: this.ACCESS_TOKEN_EXPIRY,
-          secret: this.configService.get<string>('JWT_SECRET_AT'),
-        }
-      ),
-      this.jwt.signAsync(
-        { sub: userId, email },
-        {
-          expiresIn: this.REFRESH_TOKEN_EXPIRY,
-          secret: this.configService.get<string>('JWT_SECRET_RT'),
-        }
-      ),
-    ]);
-
+    const access_token: string = await this.createAccessToken(userId, email);
+    const refresh_token: string = await this.createRefreshToken(userId, email);
     return { access_token, refresh_token };
   }
+
+  private async createAccessToken(
+    userId: number,
+    email: string
+  ): Promise<string> {
+    return this.jwt.signAsync(
+      { sub: userId, email },
+      {
+        expiresIn: this.ACCESS_TOKEN_EXPIRY,
+        secret: this.JWT_SECRET_AT,
+      }
+    );
+  }
+
+  private async createRefreshToken(
+    userId: number,
+    email: string
+  ): Promise<string> {
+    return this.jwt.signAsync(
+      { sub: userId, email },
+      {
+        expiresIn: this.REFRESH_TOKEN_EXPIRY,
+        secret: this.JWT_SECRET_RT,
+      }
+    );
+  }
 }
diff --git a/backend/src/modules/auth-module/strategies/access-token.strategie.ts b/backend/src/modules/auth-module/strategies/access-token.strategie.ts
index 250b162..00dea31 100644
--- a/backend/src/modules/auth-module/strategies/access-token.strategie.ts
+++ b/backend/src/modules/auth-module/strategies/access-token.strategie.ts
@@ -1,7 +1,7 @@
+import { Injectable } from '@nestjs/common';
 import { PassportStrategy } from '@nestjs/passport';
 import { Strategy, ExtractJwt } from 'passport-jwt';
 import { ConfigService } from '@nestjs/config';
-import { Injectable } from '@nestjs/common';
 import { JwtPayload } from '../models/types';
 
 @Injectable()
@@ -10,13 +10,17 @@ export class AccessTokenStrategy extends PassportStrategy(
   'jwt-access-token'
 ) {
   constructor(private readonly configService: ConfigService) {
-    super({
-      jwtFromRequest: ExtractJwt.fromAuthHeaderAsBearerToken(),
-      secretOrKey: configService.get<string>('JWT_SECRET_AT'),
-    });
+    super(AccessTokenStrategy.getJwtConfig(configService));
   }
 
-  public async validate(payload: JwtPayload) {
+  private static getJwtConfig(configService: ConfigService): any {
+    return {
+      jwtFromRequest: ExtractJwt.fromAuthHeaderAsBearerToken(),
+      secretOrKey: configService.get<string>('JWT_SECRET_AT'),
+    };
+  }
+
+  public async validate(payload: JwtPayload): Promise<JwtPayload> {
     return payload;
   }
 }
diff --git a/backend/src/modules/auth-module/strategies/refresh-token.strategie.ts b/backend/src/modules/auth-module/strategies/refresh-token.strategie.ts
index dc7ee43..4d6701b 100644
--- a/backend/src/modules/auth-module/strategies/refresh-token.strategie.ts
+++ b/backend/src/modules/auth-module/strategies/refresh-token.strategie.ts
@@ -1,7 +1,7 @@
+import { Injectable, ForbiddenException } from '@nestjs/common';
 import { PassportStrategy } from '@nestjs/passport';
 import { Strategy, ExtractJwt } from 'passport-jwt';
 import { ConfigService } from '@nestjs/config';
-import { ForbiddenException, Injectable } from '@nestjs/common';
 import { Request } from 'express';
 
 @Injectable()
@@ -10,11 +10,15 @@ export class RefreshTokenStrategy extends PassportStrategy(
   'jwt-refresh-token'
 ) {
   constructor(private readonly configService: ConfigService) {
-    super({
+    super(RefreshTokenStrategy.createJwtStrategyOptions(configService));
+  }
+
+  private static createJwtStrategyOptions(configService: ConfigService): any {
+    return {
       jwtFromRequest: ExtractJwt.fromAuthHeaderAsBearerToken(),
-      secretOrKey: configService.get('JWT_SECRET_RT'),
+      secretOrKey: configService.get<string>('JWT_SECRET_RT'),
       passReqToCallback: true,
-    });
+    };
   }
 
   public async validate(req: Request, payload: any) {