Worked on the gitlabhq/gitlab-runner repository to address a persistent MTU inheritance issue in Docker-in-Docker environments, which caused build packet loss and unreliable CI behavior on constrained networks. Tackled this by enhancing documentation, specifically in Markdown, to clearly explain the failure mode and provide a practical workaround using the --mtu flag. Focused on DevOps and Docker best practices, the work surfaced critical networking issues and offered actionable guidance, reducing silent failures and troubleshooting time for teams. The improvements strengthened the knowledge base for GitLab Runner users, making CI builds more reliable and onboarding smoother for those operating in low-MTU scenarios.