In April 2025, Leo Gomez refactored the Koa middleware application for the dbos-inc/dbos-transact-ts repository, focusing on stabilizing API middleware behavior and expanding the public API surface. He ensured middleware, including body parsers, was applied only once per request by attaching it directly to router verb methods, addressing issues with duplicate invocations. Leo also introduced a new GET endpoint and developed comprehensive tests to validate both middleware flow and endpoint correctness. Working primarily with JavaScript, TypeScript, and Node.js, he improved the reliability and predictability of the backend, while updating documentation to reflect the new middleware pattern and endpoint behavior.