Worked on the uktrade/platform-tools repository to deliver a focused codebase refactor using Python, emphasizing code cleanup, refactoring, and testing. The primary contribution involved removing the dependency on the check_if_commit_exists method from the Codebase class, which eliminated unused code and streamlined exception handling. This refactor simplified the codebase, reduced technical debt, and aligned the test suite with the updated architecture, lowering maintenance overhead. Additionally, the changes introduced off-repo build capabilities, enhancing CI automation and making onboarding easier for new contributors. The work resulted in a clearer, more maintainable codebase that supports scalable tooling and improved build flexibility.