Principal Engineer, System Design
TerraPower LLC.
| Company | TerraPower LLC. |
| Category | Uncategorised |
| Location | Bellevue |
| Remote | On-site (inferred) |
| Employment | Not stated |
| Level | Not stated |
| Salary | Not stated by the employer |
| Posted | 21 Jul 2026 |
| Last verified | 2 Aug 2026 |
| Source | Employer career page (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.
Principal Engineer, System Design
TerraPower, LLC. is seeking a Principal Engineer supporting the Natrium Demonstration Project. This role will support the ongoing design and delivery of the Natrium primary systems. The Natrium primary systems comprise those reactor systems responsible for heat transport, reactivity control, and containment of the reactor fuel and its coolant. You’ll collaborate with project managers, design engineers, analysts, test engineers, and other engineering specialties in a high-performing, multi-disciplinary environment to deliver the Natrium primary systems.
Join us in this high impact role to help advance a first-of-a-kind nuclear reactor towards commercial development.
Responsibilities
Drive alignment across multidisciplinary engineering teams (nuclear, thermal hydraulic, mechanical, instrumentation and controls, civil-structural) to define and refine system requirements
Design nuclear and industrial mechanical systems, including: requirements definition, analysis, specifications, and system drawings.
Develop and maintain system architecture and design documentation (e.g., Design Basis Documents, P&IDs, Interface Control Documents).
Establish equipment design bases, including: regulatory criteria, regulatory standards, functional criteria, performance criteria, and failure mode and effects.
Evaluate technology development requirements and implement development programs for novel technologies or approaches.
Ensure designs consider lifecycle factors including operability, maintainability, and reliability.
Manage technical interfaces with suppliers, including review and verification of deliverables.
Prepare engineering change packages including calculations, design reports, design drawings, and design specifications
Promote continuous learning and application of nuclear industry best practices
Interface with and support licensing activities needed to obtain both the construction and operating licenses for the reactor systems
Participate in project design reviews at project milestones and periodic assessment points to verify compliance and completeness of design.
Key Qualifications and Skills
B.S. in Mechanical Engineering or related discipline from an accre