Arthur Zsigmond developed and enhanced core features for the UBB-SE-2025-927-1 and UBB-SE-2025-927-1-A5 repositories, focusing on robust error handling and admin functionality. He centralized error management using RaiseErrorMessage across the ViewModel layer, improving reliability and maintainability. Arthur scaffolded an Exam Management System, including controllers, Razor Pages, and backend DTOs to support exam-exercise relationships. He improved the admin dashboard’s UI and implemented multiple-choice quiz functionality with immediate feedback. Working primarily with C#, ASP.NET Core, and JavaScript, Arthur enforced status code guards and refactored code for clarity, demonstrating depth in backend and frontend integration within a short timeframe.