Dhananjana Sithu developed a JWT-based authentication system for the TripMate repository, focusing on backend security and scalable access control. Using Java and Spring Security, Dhananjana introduced a JwtFilter that validates tokens and sets the authentication context for protected endpoints, while allowing public access to registration, login, and static assets. This approach established a stateless, token-based security layer, aligning with best practices and preparing the codebase for future enhancements such as role-based access control and token refresh mechanisms. The work demonstrated a solid understanding of backend development and authentication flows, though it was limited in scope to a single feature.