Senior Nuclear Engineer

Last Energy; Austin (TX); On-site; USD 100,000 - 140,000; Full time

Job summary

Last Energy, based in Austin, Texas, is searching for a Senior Nuclear Engineer to enhance their engineering team. The engineering role encompasses critical responsibilities including performing complex thermal-hydraulic and neutronics calculations. This position requires a strong educational background in nuclear engineering along with extensive industry experience.

Candidates should possess expertise in various engineering codes such as TRACE and MELCOR, and be capable of communicating effectively with diverse audiences. Join a company that is leading innovation in nuclear power.

Qualifications

• 7+ years of experience in nuclear systems analysis, safety analysis, or reactor physics.
• Proficiency with at least two nuclear engineering codes.
• Strong technical writing and communication skills.

Responsibilities

• Lead and perform complex thermal-hydraulic and neutronics calculations.
• Verify and approve engineering calculations and safety analyses.
• Develop and maintain detailed models for reactor systems.

Skills

Thermal-hydraulic calculations

Neutronics calculations

Engineering calculations approval

Technical writing

Communication skills

Education

Bachelor’s or Master’s degree in Nuclear Engineering

Tools

TRACE

MELCOR

MCNP

VERA

SCALE

SERPENT

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.

Key Duties & Responsibilities

• 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

Qualifications

• 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