During November 2025, J20120307 focused on enhancing Apple Silicon compatibility for the IBM/vllm repository. They addressed a critical build failure on Apple M1 machines by implementing macOS-specific cache size retrieval logic in C++. This targeted system programming solution restored reliable build and runtime behavior, aligning the project with cross-platform development standards. By resolving the environment-specific issue, J20120307 improved CI reliability and reduced onboarding friction for macOS developers. The work demonstrated a precise understanding of platform differences and contributed to smoother development workflows. Although the contribution was limited to a single bug fix, it addressed a deep architectural challenge effectively.