Over a two-month period, contributed to core stability and test infrastructure across NVIDIA/cuopt, llvm/clangir, and rapidsai/raft. Addressed CUDA intrinsics compatibility in llvm/clangir by backporting and extending header definitions, resolving code breakages in CUDA workflows. In NVIDIA/cuopt, refactored test data path handling for greater determinism and upgraded dependencies, while modularizing tests for scalability. Enhanced build and test reliability in rapidsai/raft by aligning public APIs and resolving LLVM/CUDA compatibility issues. Leveraged C++, CUDA, and the Google Test Framework to improve low-level performance, memory management, and testing robustness, resulting in more maintainable and reliable codebases across these repositories.