During May 2025, Sushant John focused on enhancing the reliability of distributed communication tests in the facebookresearch/param repository. He addressed a critical issue in the Param Communications Trace Replay tests by correcting data type specifications and refining expected message sizes for all_gather operations. This targeted bug fix, implemented using Python and leveraging his debugging and testing skills, ensured that the test suite more accurately reflected the actual behavior of distributed communication components. By aligning test expectations with real-world operation, Sushant improved the stability of continuous integration feedback and increased confidence in the correctness of distributed training infrastructure.