Jan Polasek contributed to the bazelbuild/bazel-central-registry repository by developing a new version of the gcem module compatible with Bazel 9. He transitioned the module’s update mechanism from patch-based updates to an overlay file approach, leveraging Bazel and version control skills to improve maintainability and streamline future upgrades. This technical shift reduced upgrade friction for Bazel 9 users by enabling smoother integration and minimizing reliance on unstable archives, thereby lowering risk. Jan’s work focused on dependency management and aligned with project conventions and reviewer feedback, demonstrating a thoughtful approach to maintainability and forward compatibility within the Bazel ecosystem.