Worked on the medplum/medplum repository to address a critical issue in transaction management by fixing a bug that previously allowed post-commit hooks to execute even when a transaction failed. Refactored the commit hook management system to clear commit hooks during rollbacks, ensuring that transactional workflows maintain data integrity and reliability. Streamlined the callback stack for pre- and post-commit hooks, making the codebase more maintainable and reducing downstream risks. Leveraged TypeScript and backend development skills, along with automated CI tools, to stabilize tests and improve overall system reliability, demonstrating a disciplined approach to transactional programming and collaborative engineering practices.