During February 2026, Xuey focused on backend reliability work in the jeejeelee/vllm repository, addressing a critical bug in the ARC Offloading Manager. Using Python, Xuey identified and resolved a KeyError that occurred when the system handled non-ready T1 blocks, ensuring that blocks are marked as most recently used without triggering exceptions. This fix improved the stability of the offload path, reducing runtime errors and enhancing system resilience under load. Xuey also updated documentation and comments to clarify the new MRU handling logic, demonstrating a methodical approach to backend development and a strong understanding of robust error prevention techniques.