Worked on code quality improvements and null-safety enhancements across the ppy/osu and ppy/osu-framework repositories, focusing on maintainability and runtime safety. The work involved removing dead code, such as the unused HandleScale method, and enabling nullable reference types within the osu.Framework.Text namespace. By propagating nullability improvements and enforcing non-nullable types in unit tests, the developer reduced the risk of null-reference errors and strengthened test robustness. Utilizing C# and applying clean code and code refactoring principles, the changes improved the overall maintainability of the codebase and ensured safer, more reliable software development practices within the framework’s core components.