Hektor Einarsson contributed to the uu-semp/swedish-learning-app-2025 repository by delivering targeted front-end improvements focused on user experience and reliability. He overhauled the home page UI and UX, removing unused scripts and CSS, updating styling, and reorganizing the main content area to streamline entry points for the game. Using CSS and HTML, Hektor ensured a cleaner, more intuitive interface. Additionally, he addressed a critical bug by adding index.js script links to key pages, guaranteeing consistent JavaScript functionality. His work improved user onboarding and reduced potential script errors, demonstrating a solid grasp of CSS styling and front-end development fundamentals.