Worked on enhancing the reliability of concurrent task execution in the picnixz/cpython repository by addressing error handling within the ProcessPoolExecutor. Focused on ensuring that each future receives its own BrokenProcessPool exception when a worker process terminates unexpectedly, which improved error clarity and the quality of tracebacks. Utilized Python and applied skills in concurrent programming and unit testing to implement and validate these changes. Added comprehensive tests to safeguard against regressions and linked the work to relevant GitHub issues for traceability. This effort strengthened the robustness of distributed task execution and demonstrated a methodical, test-driven approach to bug resolution.