Nuclear Engineer III/IV (Reactor Design)

Fissionaire is hiring a Nuclear Engineer III/IV to spearhead the design, analysis, and optimization of next-generation reactor systems in Madison, Wisconsin, onsite, with a salary range of USD 125,000 to 180,000 per year.

Responsibilities

• Oversee core and system-level design activities, spanning thermal-hydraulic, neutronic, and mechanical disciplines.
• Conduct analysis, modeling, and optimization using established nuclear design software.
• Coordinate fuel, coolant, and structural components to form integrated designs that satisfy safety, performance, and cost objectives.
• Work with mechanical, materials, and safety engineers to ensure coherent designs and readiness for regulatory review.
• Carry out risk assessments and safety analyses to verify compliance with rigorous nuclear safety standards.
• Produce technical reports, design documents, and presentations for internal teams and regulators.
• Perform trade studies and sensitivity analyses to inform design choices.
• Engage in design reviews, safety analyses, and interactions with regulatory bodies.
• Maintain up-to-date knowledge of emerging reactor technologies, materials research, and simulation methods.
• Contribute to project planning, budgeting, and scheduling to ensure timely milestone delivery.
• Support a culture of innovation, accountability, and technical excellence.

About Fissionaire

Fissionaire is advancing the next generation of nuclear technology to deliver safe, scalable, and sustainable energy. The team is small, fast-moving, and mission-driven, combining deep technical expertise with a startup mindset. As we grow, we’re designing systems that aim to redefine the role of nuclear power in the world.