In April 2025, Lee focused on backend improvements for the stripe-go repository, addressing a bug in the authentication signature computation path. Using Go and API development skills, Lee implemented a preventive check to skip signature computation when timestamps were invalid or expired, which both improved correctness and reduced unnecessary CPU usage. The solution involved isolating timestamp validation logic, making the codebase more maintainable and testable. By ensuring that signature generation only occurred with valid timestamps, Lee enhanced the reliability and performance of the Stripe Go library’s authentication flow, demonstrating a thoughtful approach to backend optimization and code quality.