During December 2024, Nate Rush enhanced the METR/vivaria repository by addressing a critical bug in the task commit retrieval process. He ensured that changes to sensitive environment files, specifically secrets.env, are now accurately tracked when determining the latest commit for a task family. Using JavaScript and TypeScript, Nate integrated backend logic with Git to include secrets.env in commit calculations, reducing the risk of missing vital updates. He also implemented regression tests to verify this behavior, improving CI/CD reliability and deployment accuracy. This work demonstrated depth in backend development, Git integration, and testing, reinforcing the project’s security and traceability.