During July 2025, Fang contributed to vllm-project/production-stack, LMCache, and vllm by building features that improved backend performance and developer experience. Fang enhanced request routing by implementing round-robin endpoint caching and optimized concurrent data structures in Python, reducing lock contention in HashTrie to boost throughput. In LMCache, Fang accelerated cache lookups by replacing SHA256 with xxhash, improving latency for high-frequency operations. Fang also refactored the Internal Cache Manager in vllm for clarity and maintainability, and updated documentation to streamline contributor onboarding. The work demonstrated depth in asynchronous programming, caching, and concurrency control, with a focus on robust, maintainable backend systems.