In July 2025, Clemens contributed to the slcs-jsc/mptrac repository by partially porting the module_sort function to run on the GPU, targeting improved performance for large-scale particle sorting. He refactored the function to accept the number of particles and updated OpenACC pragmas to ensure proper device data synchronization, establishing a GPU-based sorting workflow. This work leveraged his expertise in C, GPU computing, and parallel computing, and laid the technical foundation for future full GPU offload. While no bugs were addressed during this period, Clemens’s focused engineering advanced the project’s runtime efficiency and scalability for computationally intensive particle datasets.