Isabel Faulds enhanced the google/heir repository by delivering comprehensive documentation and expanded testing for the Operation Balancer feature. Focusing on compiler design and leveraging MLIR, Isabel improved the clarity of technical materials and introduced new test examples to validate Operation Balancer’s behavior. This work increased testing coverage and improved maintainability, supporting future development and onboarding. By prioritizing documentation and test scaffolding over bug fixes, Isabel ensured the feature was better prepared for quality assurance cycles and reduced deployment risk. The depth of the work lay in strengthening the project’s foundation, enabling more efficient iteration and smoother integration for future contributors.