Worked on the microsoft/TypeScript repository to enhance the CI/CD infrastructure by updating the continuous integration workflow for improved coverage reporting. Focused on migrating the build environment from ubuntu-22.04 to mariner-2.0, the work involved aligning configuration files and ensuring consistent support for Mariner-2.0-based images across all coverage reporting processes. Leveraged skills in CI/CD and GitHub Actions, with YAML as the primary language for configuration management. The main objective was to stabilize and maintain the CI pipelines, resulting in a more reliable and consistent build environment. No major bugs were addressed, as the emphasis remained on infrastructure improvements and maintainability.