In a dynamic, speed-driven start-up racing to deploy reactors at scale, the ModSim Director is equal parts technical authority, org-builder, systems thinker, and dot-connector, growing the team from a small core, automating the simulation-to-design workflow, and wiring ModSim into design, manufacturing, licensing, and construction so that models become steel, on schedule and to code. Reporting to the CNO / VP of Engineering, the Director of ModSim owns the strategy, quality, throughput, resourcing, and budget of the group; the multiphysics integration and verification-and-validation (V&V) consistency that bind the disciplines together; and the licensing-grade defensibility of every deliverable under a nuclear quality program (i.e. NQA-1, 10 CFR 50 Appendix B, ASME V&V 10/20/30).