Worked on improving iOS build reliability for the lichess-org/mobile repository by addressing issues in the continuous integration pipeline. Focused on updating the iOS build environment and migrating the CI runner to a newer macOS version to ensure compatibility with recent Xcode and tooling updates. Introduced shell scripting safeguards to prevent build failures when the Firebase Crashlytics upload-symbols binary is missing, reducing the risk of CI regressions and flaky outcomes. Leveraged skills in CI/CD, GitHub Actions, and shell scripting to enhance build stability, accelerate release readiness, and create a more robust and maintainable iOS development workflow for the project.