During July 2025, contributed to the TripMate repository by developing a JWT-based authentication system using Java and Spring Security. The work focused on backend development, introducing a JwtFilter to validate tokens and establish the authentication context for protected API endpoints while allowing public access to registration, login, and static assets. This implementation established a stateless, token-based security layer, aligning with best practices for scalable authentication and laying the foundation for future enhancements such as role-based access control and token refresh mechanisms. The approach emphasized maintainability and extensibility, ensuring secure API access and preparing the system for evolving authorization requirements.