Worked on stabilizing performance metrics calculations within the alibaba/MNN repository, focusing on backend development using C++. Addressed a critical bug affecting the accuracy of performance dashboards by correcting the group index decrement logic in the compute mGroupWithComputeRate function. This targeted fix prevented metric drift and ensured that rate calculations reflected true system performance. The solution was delivered as a single, well-contained change set, demonstrating careful debugging and risk management. By refining the underlying computation logic, the work contributed to more reliable analytics for users of the repository, leveraging strong C++ skills and a disciplined approach to backend problem-solving.