Worked on stabilizing code packaging reliability for the Netflix/metaflow repository, focusing on backend development and unit testing using Python. Addressed a critical bug where user files were excluded if the flow path contained hidden directory ancestors, such as .worktrees or .cache, which previously led to incomplete code packaging for Kubernetes and batch runs. The solution involved refining the packaging utility to check hidden directories only under the packaging root, preventing false negatives. Added targeted regression tests to cover scenarios with hidden ancestor and subdirectories, and validated the fix by passing the full unit test suite, enhancing maintainability and reliability.