During December 2025, W169 Q169 contributed to both the ggml-org/llama.cpp and apache/tvm repositories, focusing on backend development with C++ and CUDA. In llama.cpp, they resolved a server response error handling issue by renaming a conflicting function, which stabilized error propagation and reduced production incidents. For apache/tvm, they extended the CUDA FFI layer to support Programmatic Dependent Launch and cooperative kernel launches, enabling more dynamic and efficient GPU workloads. Their work aligned with NVIDIA CUDA guidance, improving maintainability and onboarding. These contributions demonstrated depth in GPU programming and backend systems, directly enhancing reliability and performance for production environments.