Senior Nuclear Engineer

Last Energy

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Austin, TX on site Until 8/21/2026 7+ years exp First posted November 12, 2025 Last posted November 12, 2025
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
About this role

Summary

Lead nuclear systems analysis, safety calculations, modeling, and review for innovative microreactor projects.

Job title

Senior Nuclear Engineer

Experience level

7+ years

Minimum experience

7+ years exp

Industry

nuclear

Location requirements

Austin, TX; on-site preferred; remote not specified

Salary

Not specified

Management role

No

Skills & keywords

Required skills

thermal-hydraulicneutronicsengineering calculationstechnical review

Preferred skills

regulatory experiencetechnical writing

Specializations

thermal-hydraulicsneutronicsreactor systemssafety analysis
Locations

Structured locations inferred from the posting.

Austin, TX, USA

On-site City
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