During January 2026, Successor Uno contributed to the expressjs/express repository by enhancing the reliability of the compileETag utility function through comprehensive unit testing. They developed and expanded tests in JavaScript to cover a wide range of valid and invalid input scenarios, including edge cases, ensuring the function’s behavior remained consistent and predictable. Their approach emphasized backend development best practices and robust unit testing, reducing the risk of regressions in future updates. Successor Uno also collaborated effectively through co-authored commits, demonstrating CI-readiness and clear documentation. The work focused on improving code quality and maintainability within a critical backend component.