During October 2025, Xueyang Wu developed conditional update functionality for insert loads in the StarRocks/starrocks repository. By extending the InsertPlanner to process a merge_condition property, Wu enabled targeted updates during bulk insert operations, allowing for more flexible and consistent ETL workflows. The implementation involved Java and SQL, with a strong emphasis on maintainability and correctness. Wu updated documentation to clarify the new behavior and added comprehensive SQL tests to verify conditional upserts, enhancing regression safety. This work demonstrated depth in backend development, data engineering, and testing, addressing data consistency challenges and reducing the need for post-load reconciliation.