Stephen focused on enhancing test reliability for the pinterest/starrocks repository by addressing floating-point precision issues in SQL test averages. He implemented a solution that applies rounding to average calculations, ensuring deterministic and reproducible results regardless of execution order. This approach eliminated flaky test outcomes and improved the stability of the unit testing suite, directly strengthening CI reliability for analytics features dependent on precise aggregations. Working primarily with SQL, Stephen leveraged his skills in SQL optimization and database testing to improve maintainability and robustness. During this period, he concentrated on backend quality rather than shipping new user-facing features or functionalities.