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Senior Mechanical Design Engineer

TerraPower
locationBellevue, WA, USA
PublishedPublished: 4/28/2026
Full Time

Senior Mechanical Design Engineer

Senior Mechanical Design Engineer

Bellevue, WA, USA Apply

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. TerraPowers 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 companys 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

TerraPower, LLC. is seeking a highly motivated and resourceful Senior Mechanical Design Engineer. In this role, you will create design solutions for the conceptual and preliminary design development of various reactor core components, reactor structures, and Nuclear Island components for the Natrium Generation IV Reactor. Candidates must have extensive experience in equipment design. The Senior Mechanical Design Engineer will report to the Core Component Design 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:

  • Coordinate and utilize inputs and requirements from Engineering and Project teams to produce equipment and components design solutions, including drawings, models, and specifications.
  • Perform planning for design activities and manage execution to the established plans.
  • Propose and develop tests required to validate functional and performance design requirements.
  • Perform scoping analysis and trade studies for design options.
  • Interface with cross functional team for design and analysis activities.
  • Perform engineering reviews of team members products.
  • Interface with 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.

Key Qualifications:

  • Education: B.S. degree in Mechanical engineering or equivalent preferred.
  • Minimum of five years of equipment / component design experience; relevant M.S. and Doctorate degrees may be credited for up to two or four years of experience respectively.
  • Experience with 3D CAD, SolidWorks preferred.
  • Experience with design of experiments with an emphasis on product testing.
  • Experience in finite element stress analysis, mechanical analysis methods, first principles calculations.
  • Familiarity in Design for Manufacturability (DFM) and Design for Assembly (DFA).
  • 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.
  • Excellent attention to detail.
  • The successful candidate will possess a high degree of trust and integrity, communicate openly, and display respect and a desire to foster teamwork.

The Ideal Candidate:

  • Experience or familiarity with the rules of ASME Boiler Pressure Vessel Code Section III Division 5.
  • Design experience in the nuclear industry with core assemblies is highly desirable.
  • Experience with nuclear industry operation, DOE and NRC regulations
  • Knowledge of neutronics, thermal-hydraulics, and/or structural analysis.
  • Ability to lead multidisciplinary design activities
  • Experience in finite element stress analysis using ANSYS and first principles calculations.
  • Experience with writing test requirements documents and developing nuclear product test campaigns.
  • Experience with manufacturing and methodology, especially in first article productions.
  • Experience with technical evaluation, review, and nonconformance evaluation of vendors and suppliers.

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%

TerraPowers 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 TerraPowers 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

Job Type: Full-time

Salary Range Level 11: $138,6857 - $208,027

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

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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