Worked on the google/go-github repository to refactor core GitService methods, focusing on improving type safety and memory management by changing parameter passing from by-reference to by-value. This update affected key operations such as creating and updating references, creating commits, and handling blobs, resulting in a safer and more predictable API surface. The work demonstrated strong skills in Go, API refactoring, and memory-management best practices. By delivering these changes at the commit level, the developer laid a more maintainable foundation for future enhancements, ensuring that the codebase is easier to extend and less prone to subtle bugs related to parameter handling.