Worked on modernizing CI/CD workflows for the Syndica/sig repository by migrating CircleCI Linux builds to self-hosted runners on AWS EC2. Focused on enhancing build efficiency, control, and reliability through infrastructure changes, including integration with AWS Auto Scaling Groups and Lambda-based autoscaling. Adapted the build environment for non-root execution, implemented sudo for package management, and used docker_as_user to ensure correct file ownership in coverage jobs. Updated cache management strategies by introducing a -selfhosted suffix to cache keys, preventing stale caches. Utilized AWS, Linux, and YAML to deliver a more predictable, scalable, and reproducible CI/CD pipeline.