Maxiaoqian focused on enhancing concurrency reliability in the AutoMQ/automq repository by developing a comprehensive suite of unit tests for the AsyncSemaphore component within the s3stream module. Using Java and leveraging expertise in concurrency and unit testing, Maxiaoqian designed tests that validated permit acquisition under varying resource conditions, including scenarios with insufficient or negative permits, and ensured correct release and sequential execution of asynchronous tasks. This work addressed potential production risks by improving test coverage and verifying the correctness of asynchronous synchronization, ultimately enabling safer and faster iteration on concurrency features. The depth of testing contributed to more robust and maintainable code.