James King contributed to large-scale neuroscience simulation projects by developing and refining backend features in C++ and Python. On the openbraininstitute/neurodamus repository, he implemented a configurable in-memory report buffer, allowing users to dynamically manage memory usage during simulations via a command-line interface, and fixed a bug to prevent duplicate stimuli insertion in complex cell morphologies. In the neuronsimulator/nrn repository, he improved data integrity by restoring ionic concentration type checks during STATE initialization, ensuring reliable loading of external CoreNEURON data. His work demonstrated careful attention to simulation correctness, memory management, and cross-platform compatibility, with thorough testing and configuration management.