Simulation Engineer

Simulation Software EngineerHawthorne, CA$180K-$200K Permanent About:They are rebuilding America's nuclear fuel supply chain from the ground up. They design, build, and operate uranium enrichment infrastructure — the foundation of clean, affordable, baseload energy for AI, advanced manufacturing, and next-generation reactors.Backed by Founders Fund and built by a world-class team of engineers, they move with urgency and hold themselves to the highest standards of technical rigor. If you want your work to matter at a national scale, this is the place.The Role:They are looking for a Simulation Software Engineer to own the design and development of high-fidelity simulators that model our physics and hardware systems. You'll work directly alongside hardware, chemical, and electrical engineers to build simulation infrastructure that accelerates development, surfaces failure modes before they become real problems, and validates that our systems behave exactly as designed.This is an ownership role. You'll define the architecture, set the standards, and be accountable for the correctness and reliability of mission-critical simulation systems.What You'll DoDesign and own simulators for large, distributed systems — modeling complex interactions, feedback loops, and failure modes across nominal and off-nominal conditionsBuild scalable simulation infrastructure capable of high-volume scenario generation and automated validationDefine correctness criteria and rigorously validate simulation outputs against empirical test and real-world dataPartner closely with systems and hardware teams to ensure simulations accurately reflect physical behaviorSet the architectural and engineering standards for simulation across the organizationWhat We're Looking ForRequiredBS in Computer Science, Electrical Engineering, Mechanical Engineering, Physics, or related field — advanced degree preferred7+ years building simulators for complex, real-world systemsStrong C++ and/or Python skills with experience managing large data flowsDeep understanding of distributed systems, control systems, or physical process modelingExperience validating simulations against empirical data or hardware-in-the-loop setupsUncompromising standards for correctness, robustness, and engineering rigorPreferredExperience simulating industrial, aerospace, energy, or similarly complex systems — chemical plants, rockets, power grids, or equivalentBackground in control theory, numerical methods, or systems modelingExperience running large-scale simulations for design validation or fault analysisFamiliarity with performance optimization and parallel or distributed simulation architecturesTrack record of delivering in high-stakes engineering environments where errors have real consequencesWhy This Work MattersNuclear energy is the only proven source of clean, always-on power at scale. America has ceded its enrichment capacity for decades — they are building it back. The simulations you build won't just support product development; they'll underpin the safety, performance, and regulatory credibility of infrastructure that will run for decades.