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Avalanche Energy is a Washington-based startup building compact, deployable fusion systems through rapid hardware iteration. Rather than pursuing fusion as a single grid-scale outcome, Avalanche develops transportable fusion machines designed to be built, tested, and operated on short cycles, turning real hardware into steady progress. This approach enables near-term applications that demand extreme energy density and endurance—starting with fusion neutron production for radioisotope power and other defense and space uses—while advancing the underlying fusion platform. Backed by U.S. government programs and a team experienced in delivering complex systems, Avalanche is focused on building fusion that runs in the real world, not just on paper.
You are self-motivated, energized by problem solving, and enjoy supporting a small, tight-knit team working across a wide variety of technical challenges. You take pride in precision and getting the physics right, and you thrive in an environment where priorities can shift quickly. You communicate clearly, maintain strong attention to detail, and can work independently while building strong partnerships across the company. You want to model real nuclear hardware—not hypothetical designs—and see your analysis inform actual regulatory submissions and engineering decisions. This is hands-on neutronics experience that many nuclear engineers never get.
Avalanche Energy is seeking a Nuclear Engineer, Radiation Transport to perform neutronics modeling for our fusion neutron source programs. This is a high-impact technical role. You will be responsible for developing and executing radiation transport calculations that support everything from tritium breeding and radioisotope production to shielding design and activation analysis. The work spans Monte Carlo simulation development, CAD-to-geometry workflows, variance reduction implementation, and model validation against experimental data. You will inform nuclear design choices through trade studies and parametric analysis, with your results feeding directly into hardware decisions and regulatory filings.
Location: Onsite preferred to support close integration with experimental and engineering teams.
Sites: Seattle, Washington.
Travel: Occasional travel to collaborator sites as needed.
Citizenship: This position involves access to technology controlled under ITAR and 10 CFR 810. Candidates must qualify as a U.S. Person (U.S. citizen, permanent resident, or protected individual such as a refugee or asylee).
We value people of all races, ethnicities, genders, ages, religions, and sexual orientations. We are an equal opportunity employer, and you do not need to match every listed qualification to apply. If you're excited about computational physics and making neutronics work that matters, we encourage you to apply.
Besides working on one of the most sci-fi projects on the planet, with a bad-ass team of doers who love what they do, we provide the following tangible benefits.
Stock Options. We are embarking on an unrealistically ambitious project that will change the course of life on earth. We are all owners; success will be shared.
Paid Time Off. A successful company requires rested, enthusiastic and energetic employees. We offer excellent paid time off for you to take care of yourself so we all succeed.
Flexible Schedule. Our job is to build and test fusion devices, not warm seats. We will work with you on a schedule that fits all of us.
Competitive Salary. We are a start-up with constraints, but we take care of our people.
Health Insurance. We need a healthy team. We provide 100% employer paid health, dental and vision insurance premiums, with one of the best plans available.
Team Offsites. A couple times a year we head somewhere new and do something fun to change our paradigm.
