Teemu Virolainen enhanced HIP-CUDA interoperability in the tenstorrent/vllm repository by enabling direct inclusion of HIP source files during ROCm compilation. This work focused on improving build system flexibility, allowing developers to streamline workflows that combine HIP and CUDA code. Teemu utilized CMake to modify the build process, reducing friction for teams working with GPU programming across heterogeneous environments. The solution addressed compatibility challenges and improved maintainability by tying changes to a specific issue and commit. Over the course of the month, Teemu’s engineering contributed a targeted feature that deepened ROCm build support for HIP sources without introducing regressions.