During November 2025, this developer focused on stabilizing benchmark suites in the tarantool/datafusion repository, addressing reliability and reproducibility issues in performance measurement. They resolved a map benchmark return type mismatch by aligning key and value types, ensuring tests passed consistently. Additionally, they improved the determinism of the topk_aggregate benchmark by modifying the SQL query to remove non-deterministic elements. Working primarily with Rust and SQL, the developer demonstrated strong debugging skills and a deep understanding of benchmarking and data processing. Their targeted fixes reduced noise in benchmark outcomes, supporting more accurate performance tuning and enhancing the reliability of CI pipelines.