Worked on the gitlabhq/gitlab-runner repository to enhance the portability and reliability of CI shell scripts by refactoring the logic that enabled pipefail. The approach involved removing the dependency on grep and replacing it with a POSIX-compliant case statement, which reduced reliance on external utilities and improved cross-environment consistency. This update simplified ongoing maintenance and made the scripts more robust in diverse CI environments. The work demonstrated proficiency in shell scripting and Go, with a focus on maintainability and performance. By streamlining the shell logic, the developer contributed to more stable CI pipelines and easier future enhancements.