Chemical Engineer II​/III; Nuclear Engineering Madison, WI

We’re pioneering the next generation of nuclear technology to deliver safe, scalable, and sustainable energy. Our team is small, fast‑moving, and mission‑driven —combining deep technical expertise with a startup’s sense of urgency. As we grow, we’re designing the systems that will redefine what nuclear power can do for the world.

As an emerging leader in nuclear engineering, our startup is developing revolutionary reactor technology to secure safe and abundant energy for future generations. We are seeking a highly motivated Chemical Engineer III to join our dynamic team and help us develop new molten salt technologies needed for our reactor design.

We are seeking a self‑starting Chemical Engineer with a strong background in chemical processes for the nuclear fuel cycle to contribute to our cutting‑edge development program. The ideal candidate will have expertise in molten salt chemistry and a passion for advancing nuclear energy technologies. This role involves designing, conducting, and analyzing experiments related to nuclear processes, with a focus on molten salt reactors and related systems.

Madison, WI

• Implement fuel salt separations processes including component design, material selection, process monitoring and performance assessment.
• Collaborate with interdisciplinary teams, including nuclear engineers, physicists, and materials scientists, to advance project goals.
• Identify required testing needed for design surety. Develop, plan and conduct tests.
• Ensure compliance with safety, regulatory, and environmental standards in all experimental and operational activities.
• Prepare technical reports, presentations, and publications to communicate findings to internal teams and external stakeholders.
• Stay current with advancements in nuclear chemistry, molten salt technologies, and related fields.

• Master’s degree in Nuclear Engineering, Chemistry, Chemical Engineering or a closely related field (Ph.D. preferred).
• Experience developing or operating chemical processing facilities.
• Experience developing or operating chemical processing systems that include beryllium preferred.
• Strong understanding of nuclear chemistry principles, including radiochemistry and nuclear fuel cycles.
• Demonstrated experience with molten salt chemistry or molten salt reactor systems preferred.
• Proven ability to work independently as a self‑starter, with strong problem‑solving and critical‑thinking skills.
• Excellent written and verbal communication skills for technical reporting and collaboration.
• Familiarity with analytical techniques such as spectroscopy, chromatography, or mass spectrometry for characterizing materials.
• Knowledge of nuclear safety protocols, radiation shielding, and waste management practices.
• Experience with project management or leading small research teams.
• Previous work in a laboratory or industrial setting involving high‑temperature chemistry or nuclear materials preferred.
• U.S. citizenship or permanent residency required.

• Paid time off, sick leave and holidays

Fissionaire is an Equal Opportunity Employer that does not discriminate on the basis of actual or perceived race, colour, creed, religion, national origin, ancestry, citizenship status, age, sex or gender (including pregnancy, childbirth, pregnancy‑related conditions, and lactation), gender identity or expression (including transgender status), sexual orientation, marital status, family or relationship structure, military service and veteran status, physical or mental disability, genetic information, gender identity, or any other characteristic protected by applicable federal, state, or local laws and ordinances.

Fissionaire’s management team is dedicated to this policy with respect to recruitment, hiring, placement, promotion, transfer, training, compensation, benefits, employee activities, access to facilities and programs, and general treatment during employment.