Worked on the JustJirka/P6PP repository to enhance data quality and reliability for room-related records by introducing robust validation features. Focused on backend and API development using C#, the work centered on enforcing business rules to ensure room capacity values are positive and that RoomRequest statuses are valid. This approach reduced the risk of invalid data entering the system and minimized downstream errors, supporting future consistency in validation across modules. The implementation improved data integrity by preventing the creation of invalid room records and requests, laying a foundation for more reliable business logic and maintainable backend processes moving forward.