Simulation Software Engineer

About this role

<p><strong>About the Company</strong></p> <p></p> <p><u>General Matter enriches uranium.</u></p> <p>We are designing, building, and operating the world’s lowest-cost enrichment services, here in the US.  </p> <p>In the process, we are restoring America’s ability to produce nuclear fuel to power AI, advanced manufacturing and critical industries our country relies on to remain competitive. </p> <p>Fuel drives the cost of advanced reactor electricity production, and enrichment drives the cost of the fuel that advanced reactors consume.  Reliable, low-cost enrichment is the catalyst for the nuclear Renaissance now under way.</p> <p>Our mission is to make nuclear not only the cleanest and safest source of baseload power, but also the most affordable.  We believe abundant nuclear energy will lead to a post-scarcity society. </p> <p>We were incubated inside Founders Fund, like Anduril and Palantir before us, and are backed by over a dozen of the world's top venture capital firms.  </p> <p>Our lean, world-class team of engineers and operators is applying a first-principles approach to solving the problem of nuclear fuel production.  </p> <p>We are a mission-driven company with a culture of urgency, accountability, and transparency. </p> <p>Help us build a high-energy society by making the cleanest, safest form of baseload energy the most affordable. </p> <p><strong>Simulation Software Engineer</strong></p> <div class="flex flex-col text-sm pb-25"> <article class="text-token-text-primary w-full focus:outline-none [--shadow-height:45px] has-data-writing-block:pointer-events-none has-data-writing-block:-mt-(--shadow-height) has-data-writing-block:pt-(--shadow-height) [&:has([data-writing-block])>*]:pointer-events-auto scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]" data-turn-id="request-WEB:0f8726c4-adf3-4951-a4b8-e9bf9ca50038-1" data-testid="conversation-turn-4" data-scroll-anchor="true" data-turn="assistant"> <div class="text-base my-auto mx-auto pb-10 [--thread-content-margin:--spacing(4)] @w-sm/main:[--thread-content-margin:--spacing(6)] @w-lg/main:[--thread-content-margin:--spacing(16)] px-(--thread-content-margin)"> <div class="[--thread-content-max-width:40rem] @w-lg/main:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn"> <div class="flex max-w-full flex-col grow"> <div class="min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal [.text-message+&]:mt-1" data-message-author-role="assistant" data-message-id="c2544a0a-0fe1-49ba-b93d-62e9910b667a" data-message-model-slug="gpt-5-2"> <div class="flex w-full flex-col gap-1 empty:hidden first:pt-[1px]"> <div class="markdown prose dark:prose-invert w-full wrap-break-word light markdown-new-styling">We are seeking a Simulation Software Engineer to design and build high-fidelity simulators to perform critical physics and hardware system modeling. You will work closely with hardware, chemical, and electrical engineering teams to accelerate our testing and simulation capabilities and ensure results accurately reflect physical behavior. The successful candidate will play a central role in defining the architecture, implementation standards, and operational reliability of mission-critical simulation systems.</div> <div class="markdown prose dark:prose-invert w-full wrap-break-word light markdown-new-styling"><strong><br>Responsibilities</strong></div> </div> </div> </div> </div> </div> </article> </div> <ul> <li>Architect and own simulators for large, distributed systems with complex interactions, feedback loops, and failure modes.</li> <li>Model system dynamics and control behavior across nominal and off-nominal operating conditions.</li> <li>Build scalable infrastructure for high-volume simulation, scenario generation, and automated validation.</li> <li>Define correctness criteria and validate simulation outputs against test and real-world data in partnership with systems and hardware teams.</li> </ul> <p><strong>Basic Qualifications</strong></p> <ul> <li>BS in Computer Science, Electrical Engineering, Mechanical Engineering, Physics, or related field (advanced degree preferred).</li> <li>7+ years of experience building simulators for complex, real-world systems.</li> <li>Strong programming skills in C++ and/or Python with experience handling large data flows.</li> <li>Deep understanding of modeling distributed systems, control systems, or physical processes.</li> <li>Experience validating simulations against empirical data or hardware-in-the-loop setups.</li> <li>High standards for correctness, robustness, and engineering rigor.</li> </ul> <p><strong>Preferred Skills and Experience</strong></p> <ul> <li>Experience simulating industrial, aerospace, energy, or similarly complex systems (e.g., chemical plants, rockets, power grids).</li> <li>Background in control theory, numerical methods, or systems modeling.</li> <li>Experience running large-scale simulations for design validation or fault analysis.</li> <li>Familiarity with performance…