Worked on the OSGeo/grass repository to enhance the reliability and security of continuous integration workflows. Focused on preventing cache poisoning during pull request events, the developer implemented changes in YAML to ensure forked pull requests could not overwrite shared cache keys. They reorganized CI permissions by moving them inside the Ubuntu job, which improved both security and maintainability. The work also included standardizing permissions and cleaning up configuration files for clarity. Utilizing skills in CI/CD, DevOps, and GitHub Actions, the developer delivered a feature that improved PR validation speed and safety, supporting more robust and maintainable code integration processes.