During October 2025, Justin Pan developed a Checkpointing Wait-Time Warning System for the google/orbax repository, focusing on enhancing reliability and observability in checkpoint save operations. He implemented a threshold-based detection mechanism in Python, leveraging logging and performance monitoring skills to identify and surface delays when waiting for previous saves. By introducing a constant threshold and conditional logging within the CheckpointManager, Justin enabled early detection of checkpointing bottlenecks, reducing the risk of silent stalls in critical persistence paths. This work improved the reliability of save operations and facilitated faster incident response and performance tuning for the orbax checkpointing infrastructure.