Angelosmin developed a user authentication system for the EliasEsperanza/Proyeccion-Social repository, focusing on backend improvements using PHP and Laravel. He introduced a login validation middleware and refactored the authentication controller to leverage this middleware, centralizing authentication logic and ensuring consistent feedback for all login attempts. The implementation supported user registration and logout flows, enhancing both security and maintainability. By consolidating error handling and streamlining the authentication process, Angelosmin improved the reliability and testability of the system. This work established a solid foundation for future enhancements, such as multi-factor authentication or token-based sessions, reflecting thoughtful backend engineering within a short timeframe.