Worked on the TUM-Dev/gocast repository to enhance chat performance and security through backend development using Golang. Focused on refactoring chat-related models to use pointer receivers, which improved both performance and memory efficiency across the codebase. Developed a utility for URL HTML rendering that sanitizes and safely displays chat messages, addressing potential security concerns and improving user experience. These updates not only optimized the existing chat infrastructure but also laid the groundwork for future enhancements in chat rendering. The work demonstrated a methodical approach to maintainability and scalability, leveraging Go’s strengths for robust backend solutions without introducing new bugs.