During November 2025, this developer focused on backend stability within the alibaba/MNN repository, addressing a critical issue in performance metrics calculations. Using C++ and backend development expertise, they identified and resolved a bug in the compute mGroupWithComputeRate logic, specifically correcting the group index decrement to ensure accurate rate computations. This fix prevented metric drift in performance dashboards and analytics, directly improving the reliability of monitoring tools. The solution was delivered as a targeted change with minimal risk, reflecting careful debugging and risk management. While no new features were added, the work demonstrated depth in diagnosing and resolving complex backend issues.