Wenhao Zhang modernized the CI infrastructure for the cmu-db/bustub repository by migrating build jobs from Ubuntu 24.04-based runners to self-hosted runners, focusing on GCC and Clang builds. He leveraged internal infrastructure to improve resource availability and reduce reliance on external CI services, aiming to enhance build throughput and predictability. The transition involved targeted OS configuration updates within the CI pipeline, implemented using YAML and managed through GitHub Actions. This work maintained compatibility with existing development workflows and minimized disruption, demonstrating a focused approach to CI/CD engineering and infrastructure optimization within a short project period, with depth in automation and configuration management.