CAD Designer II; 2D​/3D; Nuclear in Madison

About Us

We’re pioneering the next 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 systems that will redefine what nuclear power can do for the world.

Fissionaire is building the next of nuclear technologies, and this role sits at the heart of turning engineering intent into precise, build-ready designs. You’ll own the CAD workflow, support multidisciplinary engineering teams, and ensure every drawing stands up to nuclear-grade expectations. If you thrive in high‑accountability environments and want your work to directly shape future nuclear systems, this is where you’ll make an impact.

• Develop detailed 2D and 3D CAD models for nuclear system components, mechanical assemblies, piping, shielding, and structural elements.
• Translate engineering requirements, calculations, and specifications into manufacturable, quality‑controlled drawings.
• Maintain configuration control, drawing standards, revision logs, and documentation in accordance with nuclear QA frameworks (e.g., ASME NQA‑1, ANSI/ANS standards).
• Support design reviews by preparing accurate models, exploded views, interface checks, and tolerance analyses.
• Collaborate closely with mechanical, nuclear, thermal‑hydraulic, and systems engineers to refine concepts, resolve design issues, and ensure alignment across disciplines.
• Conduct CAD‑based simulations, clash detection, and fit‑up validation using industry tools.
• Assist in vendor interface by providing clear fabrication packages, answering technical queries, and updating drawings as needed.
• Contribute to continuous improvement of CAD workflows, libraries, and design standards.

• Associate’s or Bachelor’s degree in Drafting, Mechanical Design, Engineering Technology, or related field or 5+ years experience as a drafter/modeler.
• Professional experience in CAD design for nuclear, energy, aerospace, or similarly regulated industries.
• Strong proficiency with modern CAD tools (e.g., Solid Works, Inventor, Creo, AutoCAD, or similar).
• Solid understanding of GD&T, mechanical tolerances, fabrication methods, and material properties.
• Experience applying nuclear‑industry standards (ASME, ASTM, RCC‑MRx, etc.).
• Ability to read, interpret, and develop engineering drawings, P&IDs, and system schematics.
• Detail‑driven mindset with a disciplined approach to documentation and version control.
• U.S. citizenship or permanent required.

• Experience in reactor design, radiation shielding, balance‑of‑plant systems, or nuclear fuel cycle equipment.
• Familiarity with PLM/PDM systems (Windchill, Teamcenter, etc.).
• Background in piping design, pressure vessel design, or seismic qualification.
• Exposure to manufacturing processes, suppliers, and tolerancing best practices in regulated environments.
• Security clearance eligibility.

• Your drawings are clean, accurate, and ready for fabrication—no guesswork, no rework.
• You communicate clearly and catch issues early, keeping engineering and manufacturing aligned.
• You take ownership of your work and help push Fissionaire’s designs forward with confidence and precision.

• Competitive salary
• Comprehensive benefits including medical, dental and vision
• Paid time off, sick leave and holidays
• Bereavement leave

Fissionaire’s technology is subject to U.S. export control regulations, which require the company to review applicants’ eligibility based on their citizenship or status. As part of the application process, candidates will be asked to indicate whether they are a U.S. , green card, lawful permanent , asylee, or refugee to support this review. Because government authorization timelines can vary, Fissionaire is unable to consider alternate statuses where required approvals may not be obtainable within a timeframe that meets business needs.

Fissionaire is an Equal Opportunity Employer that does not discriminate on the basis of actual or perceived , , creed, , national , ancestry, citizenship status, , or (including , childbirth,
-related conditions, and lactation), or expression (including transgender status), , marital status, family or relationship structure, military service and veteran status, physical or mental , genetic information, , 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.