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3mo ago

Nuclear Engineer III/IV (Reactor Design)

Fissionaire Madison, WI

Madison, WI

3mo ago Closed

$125k - $180k/yr Full time Senior Design Engineering

This position is no longer accepting applications (closed May 19, 2026).

Job Description

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.

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