Drummond Fielding developed scalable I/O functionality for the IAS-Astrophysics/athenak repository, focusing on enabling per-rank output files in MPI-based simulations. He refactored the C++ codebase to dynamically generate output paths for each MPI rank, improving data management and supporting more robust simulation restarts. By updating file I/O logic and adjusting output formatting, Drummond ensured that each process writes to its own file, which aligns with high-performance computing best practices. This work lays the foundation for larger, multi-rank simulation runs and demonstrates depth in parallel computing, software design, and MPI integration, though it was limited to a single feature implementation.