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Salary
$109k – $141k per year
Location
In office (Kemmerer)
Seniority
Middle · 4+ years exp
Employment
Full-Time

Confirmed on the employer's own hiring board on Oct 6, 2026. First seen by Alion on Oct 6, 2026. TerraPower scores A on the Alion truth index.

Overview
Company
Impact
Profile match
TerraPower is a nuclear technology company headquartered in Bellevue, Washington, developing the Natrium sodium-cooled fast reactor with molten salt energy storage and producing medical radioisotopes through its TerraPower Isotopes division. Founded in 2006 with Bill Gates as chairman, it is building its first 345 MWe Natrium plant near Kemmerer in Wyoming and supplies actinium-225 for targeted alpha cancer therapies. It hires reactor and systems engineers, senior reactor operator candidates, quality assurance and control specialists, project managers and schedulers, finance, contracts and payroll staff, and training and simulation engineers.
Backed by IPO Club

TerraPower is a nuclear technology company based in Bellevue, Washington. At its core, the company is working to raise living standards globally through a more affordable, secure, and environmentally friendly form of nuclear energy along with innovations in medical isotopes to improve human health. In 2006, TerraPower originated with Bill Gates and a group of like-minded visionaries who evaluated the fundamental challenges to raising living standards around the world. They recognized energy access was crucial to the health and economic well-being of communities and decided that the private sector needed to take action and create energy sources that would advance global energy deployment. TerraPower’s mission is to be a world leader in new nuclear technologies, while developing innovators and future leaders in the nuclear field. As a result, the company’s activities in the fields of nuclear energy and related sciences are yielding significant innovations in the safety and economics of nuclear power, hybrid energy and medical applications - all for significant human health benefits.”

TerraPower is seeking to hire highly motivated and forward-thinking professionals who are interested in focusing on advanced nuclear reactor research and development and influencing change within the nuclear power landscape and bringing forward the critical production of medical isotopes. TerraPower is an Equal Opportunity Employer. We do not discriminate in hiring on the basis of sex, gender identity, sexual orientation, race, color, religious creed, national origin, physical or mental disability, protected Veteran status, or any other characteristic protected by federal, state, or local law. 

Site Design Engineering Mechanical Engineer 

The Site Design Engineering Mechanical Engineer will perform design follow activities and oversight as part of the mechanical engineering design team for the Natrium Demonstration Project, TerraPower's groundbreaking advanced sodium-cooled fast reactor plant under construction near Kemmerer, Wyoming. This role is critical in ensuring that engineering support aligns with construction, testing, startup, and turnover activities while maintaining compliance with the design and licensing basis, nuclear safety standards, and project requirements.

This position is based onsite at the Natrium Demonstration Project in Kemmerer, Wyoming, and reports to the Site Design Engineering Manager.

Responsibilities:  

  • Perform design follow and oversight of mechanical/systems/piping activities in direct support of construction, testing, system startup, commissioning, and turnover to operations. This includes technical review, approval, and issuance of drawing and design deliverables to ensure they conform to the approved design basis, licensing commitments, and regulatory requirements.
  • Serve as key onsite engineering interface for mechanical/systems/piping issues with key stakeholders, including construction management, field engineering teams, licensing and regulatory affairs, quality assurance, the utility owner/operator, procurement, suppliers, and external regulators (e.g., NRC). Resolve technical and engineering issues arising in the field efficiently and collaboratively.
  • Disposition design changes, nonconformances, and requests for information for all TerraPower division of responsibility deliverables for the Natrium Demo project.
  • Manage priority conflicts when competing demands emerge across engineering tasks. Partner with other team leads to resolve issues at the working level; escalate unresolved or high-impact conflicts to senior leadership for timely decisions.
  • Support Project Controls organization, Field Engineering, Construction, Home Office, to prioritize work activities to support the construction schedule.
  • Ensure all work processes, technical outputs, and deliverables adhere to contract requirements, TerraPower project standards, industry standards, and nuclear regulatory expectations for quality, configuration management, and design control.

Key Qualifications and Skills  

  • Bachelor's degree (or higher) in Mechanical Engineering from an accredited institution. Advanced degree and/or professional engineering registration (PE) preferred.
  • 4+ years of engineering experience in design, construction support, or field engineering, preferably on large-scale EPC projects. Nuclear experience preferred. Job level based off of experience.
  • Experience interfacing with construction, procurement, quality, licensing, and regulatory entities to resolve complex onsite technical issues while maintaining schedule and safety priorities is desired.
  • Understanding of nuclear design and licensing basis requirements, configuration management, and quality assurance programs in regulated nuclear environments desired (e.g., 10 CFR 50, 10 CFR 52, NRC guidance).
  • Excellent leadership, communication, and conflict-resolution skills, with being part of high-performing teams in high-stakes environments.
  • Ability to obtain and maintain site access and any required security clearances for work at a nuclear construction site is required.
  • Familiarization with codes used in nuclear construction desired. For instance, NQA-1, ASME Section III, VIII, B31.1, B31.3, ACI-349, 318, AISC N690, 360, IEEE 603.

This position is subject to qualification requirements in accordance with ANSI/ANS 3.1. Candidates must meet the minimum education and experience criteria applicable to the role, including relevant nuclear industry experience where required. Verification of data will be part of the hiring process.

Job Functions:

Job Functions are physical actions and/or working conditions associated with the position. These functions may also constitute essential functions for the job which the employee must be able to fulfill, with or without accommodation.  Information provided below is to help describe the job so that the applicant has a reasonable understanding of the job duties/expectations.  An applicant's ability to perform and/or tolerate these actions and conditions will be discussed and workplace accommodations may be made on a case-by-case basis following an individualized assessment of the applicant and other considerations, including but not limited to any governing safety standards.

  • Motor Abilities: Sitting for extended periods, bending/stooping, grasping/gripping, fine motor control (hands)
  • Physical exertion and/or requirements: Minimal, with ability to safely lift up to 25 pounds.
  • Repetitive work: Prolonged
  • Special Senses: Visual and audio focused work
  • Work Conditions: Stairs, typing/keyboard, standard and/or sitting working environment of >8 hours/day
  • Travel required 0-10%

TerraPower’s technology is controlled for export by various agencies of the U.S. Government.  TerraPower must evaluate applicants who are foreign nationals (other than asylees, refugees, or lawful permanent residents) in accordance with U.S. Government export control requirements.  To facilitate TerraPower’s export control reviews, you will be asked as part of the application process to identify whether you are a U.S. Citizen or national, asylee, refugee, or lawful permanent resident of the United States.  Government export authorization approval times vary.  Based on the business needs for a particular position, TerraPower may not consider a foreign national from a country if it is impracticable to obtain timely Government export approval.

Job details

Salary Range: $108,600 - $141,039

Any salary offered within the posted salary band is based on market data and commensurate with the selected candidate’s qualifications and experience. This range is specific to WY State.

Job Type: Full-time

Benefits:

  • Competitive Compensation
  • Salary, eligible to participate in discretionary short-term incentive payments
  • Comprehensive Medical and Wellness Benefits
    • Medical
    • Vision
    • Dental
    • Life and Disability
    • Gender Affirmation Benefits
  • Parental Leave
  • 401k Plan
  • Generous Paid Time Off (PTO)
    • 21 days of annually accrued PTO
  • Generous Holiday Schedule
    • 10 paid holidays
  • Relocation Assistance
  • Professional and Educational Support Opportunities

TerraPower Career and Benefits information:  https://www.terrapower.com/contact-us/careers/

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