Senior Nuclear Engineer

Job Description

Job Description

Last Energy is a fast-growing technology company redefining how nuclear power is designed, manufactured, and deployed. We are building a new generation of modular, distributed nuclear plants engineered for speed, scalability, and real-world impact.

We are seeking a Senior Nuclear Engineer to join our core engineering team and drive the analytical rigor behind our microreactor design. This role sits at the intersection of innovation and execution , where complex modeling meets the fast-paced reality of startup deployment. This role will act as both a technical leader and independent thinker , directly influencing design decisions that shape the future of energy.

• Lead and perform complex thermal-hydraulic and neutronics calculations
• Independently verify and approve engineering calculations and safety analyses prepared by peers and junior engineers
• Provide expert-level review of design basis documents, licensing submittals, and technical evaluations
• Mentor and guide junior engineers in analytical methods and modeling techniques
• Develop and maintain detailed models for reactor systems and accident scenarios
• Participate in peer reviews and regulatory interactions as a technical authority
• Contribute to continuous improvement initiatives by identifying gaps and proposing innovative solutions
• Adapt quickly to evolving project needs, regulatory changes, and emergent technical challenges

• Bachelor’s or Master’s degree in Nuclear Engineering or a closely related discipline.
• 7+ years of experience in nuclear systems analysis, safety analysis, or reactor physics.
• Proficiency with at least two of the following codes: TRACE, MELCOR, MCNP, VERA, SCALE, SERPENT.
• Demonstrated experience performing and reviewing complex engineering calculations.
• Strong technical writing and communication skills, with the ability to present to both technical and non-technical audiences.
• Department of Energy regulatory experience is preferred