Worked on the alibaba/zvec repository to deliver a Segment Fetching Performance Enhancement feature focused on optimizing data retrieval. The approach involved simplifying function parameters, refining the handling of local document IDs, and removing redundant code paths to streamline the fetch logic. Using C++ and leveraging performance optimization and unit testing skills, the work improved the efficiency of segment data fetching while maintaining correctness. All changes were validated through targeted code review and local testing, reducing maintenance complexity and potential edge cases. This effort established a more scalable foundation for future enhancements to the data retrieval process within the repository.