Worked on modernizing the CI infrastructure for the cmu-db/bustub repository by migrating build jobs from Ubuntu 24.04-based runners to self-hosted runners. This transition leveraged internal infrastructure to improve resource availability and potentially reduce build times, while also decreasing reliance on external CI resources. The update was implemented through targeted OS configuration changes in the CI pipeline using GitHub Actions and YAML. The migration enhanced build pipeline predictability and throughput, providing faster feedback for developers. Throughout the process, compatibility with the existing bustub repository was maintained, and the transition was managed to minimize disruption for ongoing development activities.