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Salary
$132k – $171k per year
Location
In office (Bellevue)
Seniority
Senior · 8+ years exp
Employment
Full-Time

Confirmed on the employer's own hiring board on Oct 22, 2026. First seen by Alion on Oct 8, 2026. TerraPower scores B 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. 

Senior Mechanical Design Engineer

In this role, you will create design solutions for the design development of various reactor structures and components for the Natrium Generation IV Reactor. Candidates must have extensive experience in equipment design. The Senior Mechanical Design Engineer will report to the Reactor Enclosure System Manager. The Senior Mechanical Design Engineer will work as part of a high functioning team of engineers and scientists focused on developing the design of next generation advanced nuclear reactors.

Responsibilities

  • Design of reactor structures and components from requirements through final design.
  • Coordinate inputs and requirements from Engineering and Project teams to produce equipment and components design solutions.
  • Perform scoping analysis and calculations for design options.
  • Interface with the team’s engineering analysis activities.
  • Technically manage supplier activities.
  • Present equipment and components design results for design reviews.
  • Assess technical merit of solutions provided by team members, including leading design reviews.
  • Interface with junior engineers and subcontractors, providing direction and mentoring.
  • Support continuous learning and application of nuclear industry best practices to maintain the highest quality of engineering design and proactively identify process change/enhancement opportunities.

Required Qualifications and Skills  

  • Education: B.S. degree in Mechanical engineering or equivalent preferred
  • Minimum of eight years of equipment / component design experience; relevant M.S. degree credited as two years of experience.
  • Working experience with ASME Boiler and Pressure Vessel Code Section III.
  • Experience writing design specifications.
  • Experience in Design for Manufacturability (DFM) and Design for Assembly (DFA).
  • Experience in finite element stress analysis, mechanical analysis methods, and commercial mechanical stress analysis modeling tools with emphasis on ANSYS.
  • Excellent writing and communication skills.
  • Strong analytical/problem solving skills, creative thinker.
  • Ability to work with minimum direction to solve challenging problems.
  • Ability to work on multiple tasks concurrently during a given work week.
  • Familiarity with CAD, SolidWorks preferred.
  • The successful candidate will possess a high degree of trust and integrity, communicate openly and display respect and a desire to foster teamwork.

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: $131,828 - $171,206

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 Washington 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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