Sorin Petreasca worked on stabilizing the continuous integration workflow for the multiversx/mx-contracts-rs repository, focusing on improving build determinism and release reliability. He achieved this by pinning the Rust toolchain to version 1.86 within GitHub Actions, ensuring that builds remained consistent across environments. Additionally, Sorin updated the release artifact image tag from v9.0.0 to v10.0.0, which enabled reproducible releases and simplified version tracking for contributors. His work leveraged YAML for workflow configuration and demonstrated a strong grasp of CI/CD automation. These changes reduced CI flakiness and made the release process more predictable for the development team.