Isa Del Castillo maintained QA data integrity for the w3c/aria-at-app repository by delivering an administrative update to the tester roster, ensuring that test coverage information remained current and accurate. Using Git for change tracking and administrative data management, Isa focused on repository hygiene without introducing functional changes to the application. This update improved the reliability of test planning and enhanced auditability, supporting stronger QA governance and traceability. Although no major bugs were fixed during this period, Isa’s work enabled more effective quality assurance processes. The technical approach demonstrated attention to detail in data management and proficiency with Git workflows.