Last Energy

End-to-end services for small nuclear plants

Senior Nuclear Engineer

Mechanical EngineeringConfirmed live in the last 24 hours

Full-timeAustin, TX, USANo salary listed

About the Job

Requirements

Bachelor's or Master's degree in Nuclear Engineering or a closely related discipline.
At least 8 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, or SERPENT.
Demonstrated experience performing and reviewing complex engineering calculations.
Strong technical writing and communication skills, with the ability to present to technical and non-technical audiences.

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 solutions.
Adapt to evolving project needs, regulatory changes, and emergent technical challenges.

Desired Qualifications

Department of Energy regulatory experience.

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 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
8+ 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

About the Company

Last Energy

End-to-end services for small nuclear plants

Last Energy builds small, water-cooled nuclear power plants and provides end-to-end services from planning to maintenance. Its modular reactors use proven designs to supply heat and electricity for industrial uses, including combined heat and power and green-fuel production. It differentiates itself through standardized modules and a full lifecycle service, aiming for faster, lower-cost deployment. Its goal is to make scalable, low-emission nuclear power practical for global markets that support clean technology.

Company size: 51-200
Company stage: Series C
Total funding: $164M
Headquarters: Austin, TX
Founded: 2020

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