Worked on backend stability and cache management for the sglang project, focusing on the HiMambaRadixCache component across the ping1jing2/sglang and yhyang201/sglang repositories. Addressed critical bugs in Python, improving eviction logic to correctly handle nodes with children and prevent stale assertions, which enhanced cache reliability and reduced runtime errors. Further strengthened cache integrity by ensuring host-referenced nodes were preserved during tombstone cleanup, mitigating risks of data loss and corruption in production environments. Emphasized robust unit testing and collaborative code review, delivering targeted improvements that supported system stability and technical correctness without introducing new user-facing features during this period.