Contributed to the open-mpi/ompi repository by developing UBCL-based one-sided communication support across both the PML and OSC layers, enabling Open MPI to better handle UBCL-oriented workloads with enhanced performance potential. This work required cross-layer integration, collaborative development with multiple contributors, and careful C programming to ensure consistency and reliability. Additionally, addressed build system complexity by removing unused CUDA-related macros from the m4 configuration, streamlining the build process and reducing potential misconfigurations. The efforts combined expertise in C, MPI, and macro processing, resulting in improved communication capabilities and a more maintainable build system for the Open MPI project.