Yiwei worked on stabilizing and scaling CI/CD infrastructure for the vllm-project, focusing on the ci-infra and tpu-inference repositories. Over two months, Yiwei delivered secure, scalable pipelines by hardening CI token handling, provisioning high-core CPU groups for faster builds, and enhancing observability with Buildkite monitoring and GCP Ops Agent integration. Using Terraform, Bash, and Python, Yiwei centralized Docker build steps and improved environment propagation for TPU inference testing. The work included resolving Buildkite agent race conditions and rolling back unnecessary GKE resources to reduce risk and cost, demonstrating a deep understanding of cloud infrastructure and continuous integration best practices.