Worked on enhancing the reliability and correctness of the User-Defined Index (UDI) feature for partitioned indices in the facebook/rocksdb repository. Focused on addressing a critical bug that previously caused infinite loops during index block generation, the work involved refining the logic for writing meta blocks and strengthening UDI key handling across partitions. Leveraged C++ for database development, applying performance optimization and unit testing skills to ensure stable and predictable UDI behavior. These improvements reduced production risk and improved the overall stability of partitioned indices, directly benefiting customers who depend on RocksDB for high-performance, reliable data storage and retrieval.