Senior Mechanical Engineer - Supports
TerraPower LLC.
| Company | TerraPower LLC. |
| Category | Engineering |
| Location | Bellevue |
| Remote | On-site (inferred) |
| Employment | Not stated |
| Level | Senior |
| Salary | Not stated by the employer |
| Posted | 13 May 2026 |
| Last verified | 9 Aug 2026 |
| Source | Employer ATS (greenhouse) |
Description
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 Engineer
The Senior Mechanical Engineer will report to a Reactor Enclosure System Manager and be focused on the design of reactor mechanical components and structures within the Natrium Generation IV Reactor. The successful candidate will integrate and coordinate with engineers working on the reactor and interfacing systems as part of a high-performing team of engineers and scientists.
Responsibilities
Develop reactor components from requirements specification through final design and component fabrication and assembly.
Develop and maintain design specifications in accordance with project codes of record, including ASME BPVC Sect III Div 5.
Perform scoping analysis to support design modifications and evaluate sensitivities.
Collaborate with multidisciplinary engineering teams to define design requirements, develop detailed equipment interface controls, resolve technical issues, and optimize component performance.
Provide technical direction and oversight of supplier activities, working with or as the technical representative to ensure delivery of deliverables, as well as coordination and performance of technical reviews of deliverables.
Participate in planning efforts and manage detailed schedule activity execution for design activities within a team and across organizational boundaries.
Participate in engineering change processes, nonconformance evaluations, and corrective action development as required.
Maintain current knowledge of ASME BPVC Sect III revisions, NRC guidance, and industry best practices.
Required Qualifications and Skills
B.S. in Mechanical or related discipline from an accredited university and 6+ years direct experience.
Demonstrated experience in the mechanical design of complex structures and equipment and multi-discipline integration. Previous experience with nuclear mechanical components, nuclear reactor equipment, or similar design is highly desired.
Experience in finite element stress analysis, mechanical analysis methods, and commercial mechanical stress analysis modeling tools with emphasis on ANSYS.
Familiarity with CAD software, SolidWorks preferred.
Working knowledge of the ASME BPVC Sect III Code is highly desired.