Over a two-month period, contributed to the vodaioan03/UBB-SE-2025-927-1 and related repositories by building and enhancing core features for enrollment, exercise management, and admin dashboards. Focused on robust API development and integration using C#, ASP.NET Core, and JavaScript, the work included data modeling improvements, DTO-based endpoints, and comprehensive unit testing. Delivered a new exercise ecosystem with multiple types and answer submission, stabilized global theming for consistent UI/UX, and implemented course tagging with advanced filtering. Codebase cleanup and refactoring improved maintainability, while proxy-interface patterns and dependency injection enhanced testability and modularity across backend and frontend components.