Worked on the sj26/serena repository to enhance the robustness and reliability of the Language Server and file input/output operations. Focused on backend development using Python, the work addressed error handling by introducing checks for missing keys and safe property access, preventing crashes during relative path resolution and document root operations. Improvements to file handling included verifying file existence before reading and supporting multiple encodings such as utf-8 and latin-1, with a fallback to system defaults. These changes provided a more stable foundation for developer workflows, emphasizing maintainability and compatibility without introducing new features but resolving three critical bugs.