Leon Lin focused on stabilizing the test infrastructure for the facebookresearch/param repository by addressing a critical bug affecting CUDA stream handling in Triton kernel trace regeneration. Using Python and leveraging expertise in CUDA, debugging, and testing, Leon corrected the stream ID propagation in the et_replay trace generation process, ensuring that raw CUDA streams were accurately captured and passed to kernel run functions. This targeted fix improved the fidelity of regenerated traces, reduced flaky test runs, and enhanced overall test reliability. The work demonstrated a deep understanding of low-level test tooling and contributed to the robustness of the repository’s testing framework.