Yiyin worked on the alibaba/rtp-llm repository, delivering a feature that improved test reliability and parallelism for DeepEP model tests. By implementing dynamic port allocation through a new PortsContext utility, Yiyin enabled each parallel test to obtain a unique, usable port, reducing conflicts and flakiness during continuous integration runs. The work involved refactoring existing testing utilities in Python and C++ to centralize port management, leveraging skills in distributed systems and multi-processing. This enhancement shortened test feedback cycles and increased deployment confidence, reflecting a thoughtful approach to engineering robust, scalable testing infrastructure within a complex, CUDA-accelerated machine learning environment.