Cetin worked on stabilizing the CI Rust toolchain policy for the chainwayxyz/clementine repository, focusing on improving the reliability of continuous integration workflows. He consolidated and rationalized the use of Rust toolchains within GitHub Actions, implementing a strategy that allowed controlled transitions between stable and nightly toolchains. By pinning a specific nightly version and updating nightly dates to align with Rust’s post-1.85 release cadence, Cetin reduced CI flakiness and improved test consistency. His work, primarily using YAML and leveraging CI/CD and DevOps practices, introduced revert logic to maintain compatibility, ensuring the CI environment remained stable as Rust evolved.