Site Design Engineering Lead Mechanical Engineer

TerraPower LLC.; Kemmerer (WY); On-site; USD 143,000 - 191,000; Full time

Benefits offered by this job

Competitive compensation

Discretionary incentive payments

Comprehensive medical and wellness

401k plan

Generous PTO and holidays

Relocation assistance

Professional and educational support

Job summary

TerraPower LLC, based in Bellevue, Washington, seeks a Site Design Engineering Lead Mechanical Engineer for the Natrium Demonstration Project near Kemmerer, Wyoming. The role focuses on leading the onsite mechanical design team and aligning design, testing, startup, and turnover with safety standards and project requirements.

The position reports to the Site Design Engineering Manager and requires extensive nuclear experience, leadership, and collaboration with construction, licensing, and

Qualifications

• Bachelor's degree in Mechanical Engineering from an accredited institution.
• Minimum 10–15 years of progressive engineering experience, with 5–7 years in leadership.
• Experience in nuclear facility design, construction support, or field engineering.

Responsibilities

• Lead onsite Mechanical Engineering team across design, field engineering, and construction support.
• Interface with construction management, licensing, QA, regulators, and procurement to resolve issues.
• Ensure compliance with design basis, licensing commitments, and safety standards.

Skills

Leadership

Nuclear design knowledge

Regulatory interface

Communication

Mentoring engineers

Project coordination

Education

Bachelor's degree in Mechanical Engineering

Advanced degree or PE preferred

Job description

Site Design Engineering Lead Mechanical Engineer

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 Lead Mechanical Engineer

The Site Design Engineering Lead Mechanical Engineer will lead and oversee the onsite 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

• Lead onsite Mechanical Engineering team. The team comprises TerraPower employees and subcontracted resources.
• Oversee execution of all mechanical design follow and field engineering 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 the primary onsite engineering interface for mechanical 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.
• Manage priority conflicts and resource allocation when competing demands emerge across engineering tasks. Partner with other team leads to resolve issues at the working level; elevate 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.
• Foster employee development by mentoring engineers, identifying and facilitating relevant training opportunities, and assigning challenging, growth‑oriented tasks within the Natrium program scope.
• Support recruitment, onboarding, and indoctrination processes for new engineers joining the onsite mechanical team, ensuring alignment with project standards, nuclear quality programs, and site‑specific safety and security protocols.
• Ensure all work processes, technical outputs, and deliverables within the group's scope 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 or professional engineering registration (PE) preferred.
• Minimum 10–15 years of progressive engineering experience, with at least 5–7 years in a leadership or supervisory role leading engineering teams.
• Significant experience in nuclear facility design, construction support, or field engineering, preferably on large-scale nuclear new-build, demonstration, or advanced reactor projects. Familiarity with sodium‑cooled fast reactor technology, advanced nuclear systems, or DOE‑funded demonstration projects is highly desirable.
• Proven track record of interfacing with construction, procurement, quality, licensing, and regulatory entities to resolve complex onsite technical issues while maintaining schedule and safety priorities.
• Strong understanding of nuclear design and licensing basis requirements, configuration management, and quality assurance programs in regulated nuclear environments (e.g., 10 CFR 50, 10 CFR 52, NRC guidance).
• Excellent leadership, communication, and conflict‑resolution skills, with experience mentoring engineers and building 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.
• Familiarization with codes used in nuclear construction. 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.
• 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: $142,995 - $190,661
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 Wyoming State.

Job Type: Full‑time

• Competitive Compensation
• Salary, eligible to participate in discretionary short‑term incentive payments
• Comprehensive Medical and Wellness Benefits
  • Medical
  • Vision
  • Dental
  • Life and Disability
  • Gender Affimation Benefits
• 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

We invite applicants to share their demographic background. If you choose to complete this survey, your responses may be used to identify areas of improvement in our hiring process.

As set forth in TerraPower LLC.’s Equal Employment Opportunity policy,we do not discriminate on the basis of any protected group status under any applicable law.

The application deadline for this role is October 6, 2026