Worked on the stripe-go repository to enhance the reliability and performance of authentication signature validation in backend systems. Focused on the signature computation path, the developer introduced a preventive check that skips signature generation when timestamps are invalid or expired, directly addressing potential issues with incorrect signatures and unnecessary CPU usage. By isolating the timestamp validation logic, the codebase became more maintainable and testable. This work, implemented in Go and leveraging API development and backend engineering skills, resulted in faster request handling and improved correctness for typical authentication flows, while also contributing to the overall code quality of the library.