Tianyi Jin focused on CI security hardening for the piplabs/story repository, addressing a critical vulnerability by removing a hardcoded GitHub Personal Access Token from the CI workflow. Leveraging skills in CI/CD, GitHub Actions, and Go Modules, Tianyi migrated authentication to use secrets.GH_PAT, ensuring credentials were securely managed. The work included updating YAML-based workflow configurations, refreshing the Go environment, and clearing the module cache to improve dependency reliability. This targeted bug fix reduced the risk of credential leakage and enhanced build stability. The depth of the work demonstrated careful attention to secure automation and robust dependency management within Go-based projects.