Worked on build system maintenance for the Shopify/grpc repository, focusing on improving reliability and maintainability. Addressed technical debt by removing deprecated upb alias references throughout the codebase, updating BUILD files to reference upb targets directly. This cleanup reduced the risk of alias-related breakages and streamlined the build configuration, making it easier for new contributors to onboard. The work involved careful code refactoring and dependency management using Bazel, with attention to minimizing disruption across multiple directories. Utilized C++ and Python skills to ensure the build system remained robust, resulting in a cleaner, more maintainable project structure for ongoing development.