Worked on foundational enhancements to the spinnaker/spinnaker repository, focusing on improving GitHub App authentication reliability and operational stability. Developed a token refresh mechanism to ensure seamless access and prevent authentication expiry, and introduced a dedicated authenticator factory for robust token lifecycle management. Enhanced test coverage by adding integration tests that perform real HTTP calls, validating end-to-end authentication flows. Updated critical dependencies to BOM-managed versions, strengthening security and maintainability. Addressed rate-limit logging issues by fixing a division-by-zero error, reducing misleading logs. Utilized Java, Spring, and backend development skills to deliver a more reliable and maintainable GitHub integration for Spinnaker.