Minwoo Kang focused on backend development and database internals, addressing critical data integrity issues in the StoreScanner component of both the apache/hbase and HubSpot/hbase repositories. He resolved a bug where flush operations could cause the scanner to return rows from incorrect keys, particularly when delete cells were present. Using Java, he updated the logic for detecting changes to the top cell, ensuring accurate row data after flushes. Minwoo reinforced these fixes with targeted regression tests, such as testFlushBeforeCompletingScanWithDeleteCell, to validate behavior across repositories. His work improved scan reliability and reduced the risk of cross-row data leakage in high-throughput environments.