Senior Full Stack Engineer
I build web and mobile products end to end with TypeScript, Next.js, React Native, NestJS and Python. 10 years across SaaS, fintech, esports and security, usually working directly with founders.
All projects
Crest Auth System
Crest is a secure and scalable authentication service built with NestJS, featuring OAuth 2.0 integration and JWT-based session management.
Core Features
- OAuth 2.0 Integration: Seamless social authentication with Google using Passport.js, with expandable architecture for additional platforms (GitHub, Facebook, Twitter)
- JWT Authentication: Secure token generation and validation using Passport-JWT strategy
- User Management: Robust user profile handling with automatic profile creation on first OAuth sign-in
- Role-Based Authorization: Flexible access control using Guards and Decorators
Tech Stack
Authentication Flow
- OAuth provider authentication
- Automatic user registration/login
- JWT token generation
- Secure token delivery to client
OAuth Flow
Client Authentication
User clicks "Sign in" button in Next.js app (any client)
client
API Redirect
NestJS /auth/google/signin endpoint redirects to Google
api
Google Consent
User sees Google consent screen if not already authorized
google
Callback Processing
Google redirects to /auth/google/callback, checks user in database
apidatabase
JWT Generation
Generate JWT with PassportJS and redirect to client with token
apiclient