Worked on improving the build process and CI/CD pipeline for the ethereum/execution-specs and ethereum/execution-spec-tests repositories by addressing noisy DeprecationWarnings generated by Python’s tarfile module during fixture downloads. Applied targeted log filtering to suppress these warnings, resulting in cleaner build logs and faster troubleshooting without altering the core functionality of fixture handling. Demonstrated a consistent, cross-repository approach to log hygiene, ensuring that fixture reliability was maintained throughout. Utilized Python and testing best practices to enhance the developer experience, focusing on stability and maintainability in automated workflows while resolving two bugs related to build log verbosity and warning management.