During October 2024, Lei Yi focused on improving reliability in the google/orbax repository by addressing emergency checkpoint cleanup. Lei developed and integrated a dedicated cleanup method within the CheckpointManager, ensuring that local temporary directories are removed whenever an emergency checkpoint is created. This approach prevented the accumulation of stale files, reduced disk usage, and streamlined the checkpointing workflow. Working primarily in Python, Lei applied skills in checkpointing, error handling, and system administration to enhance the robustness of the system. The work demonstrated careful attention to operational reliability and maintenance, addressing a specific bug and contributing to the overall stability of orbax.