Andreas worked on the HoiskolensChemikerforening/hc-backend repository, focusing on enhancing the Audiochromatene Rentals feature. He implemented category-specific views and templates, improved routing, and refined pagination to better organize and display rental objects within the Audiochromatene category. Using Django, Python, and HTML, Andreas refactored the rental service to streamline CRUD flows, ensuring that object creation and editing redirected users to the correct category index. He also developed detailed view and contact templates tailored to Audiochromatene, updating URL routing to support these additions. The work demonstrated a focused approach to backend development and user interface consistency within a defined scope.