During March 2026, Paul Petit focused on stabilizing Python 3.9 compatibility for the GitGuardian/ggshield repository. He addressed type-checking and linting issues by refactoring code and updating CI/CD pipelines to ensure consistent behavior across Python versions. Using Python and YAML, Paul resolved Pyright errors and modified the linting workflow to run specifically on Python 3.9, which improved maintainability and reduced downstream reliability risks. His work centered on bug fixing rather than feature development, demonstrating depth in code health and cross-version support. The technical approach emphasized type hinting and CI reliability, resulting in a more robust development environment.