Commonwealth Fusion Systems
Direct Lever career site

Senior Mechanical Engineer

Location
Milpitas, CA · On-site
Job type
Full-time
Level
Lead / Staff
Experience
8+ years
Education
Bachelor's degree
Listed
14 days ago

Skills & highlights for this role

  • 3D modeling
  • FEA tools (COMSOL, ANSYS, or equivalent)
  • mechanical design of R&D systems and manufacturing equipment
  • vendor selection and qualification
  • design reviews
  • technical documentation
  • cross-functional collaboration
  • communication

Also useful

  • SolidWorks
  • NX
  • first-of-kind experimental tool development
  • Semi-S8
  • ASME
  • ACI
  • ASTM
  • manufacturing equipment operation

What you'll do

  • Lead the design and implementation of advanced R&D equipment for thin film processing, including ownership of key mechanical modules and sub-systems
  • Lead design reviews for key mechanical subsystems
  • Generate and maintain interfaces with other engineering subsystems
  • Report on and be accountable for project progress to stakeholders
  • Work effectively within a multi-disciplinary team of top scientists and engineers
  • Mentor engineering staff for effectiveness and delivery of on-time & in-spec outcomes
  • Get things done: drive projects, consistently deliver, act with speed

What we’re looking for

  • Bachelor's degree in Mechanical Engineering or related field (or equivalent industrial experience)
  • 8+ years of experience with 7+ years of experience working as a senior mechanical design engineer or engineering team lead in a relevant context: design and implementation of R&D systems and manufacturing equipment
  • Ability to conceive of novel solutions for complex engineering systems in challenging environments
  • Expertise with 3D modeling; preferred experience with SolidWorks and NX
  • Experience with COMSOL, ANSYS or other FEA tools
  • Ability to select and qualify vendors for components or subsystems
  • Demonstrated ability to lead in either direct or matrix structures
  • Strong verbal and written communication skills and a dedication to high-quality documentation

Bonus points for

  • Prior success building first-of-kind or experimental tools for material science or semiconductor R&D
  • Familiarity in applying Semi-S8, ASME, ACI, ASTM, and other mechanical standards to design solutions
  • Experience with the operation of equipment in a manufacturing environment

Must-have Requirements

  • Ability to occasionally lift up to 50 lbs
  • Perform activities such as stooping, climbing, standing, or sitting for extended periods of time
  • Dedication to safety to mitigate industrial hazards that may include heat, cold, noise, fumes, strong magnets, lead (Pb), high voltage, and cryogenics
  • Willingness to travel or work required nights/weekends/on-call occasionally
  • #LI-Onsite
  • At CFS, we excel in fast-paced environments, driven by our values of integrity, execution, impact, and self-critique. As we grow, we’re eager to bring on mission-driven folks who offer diverse perspectives and fresh ways to tackle challenges.

This role requires compliance with U.S. laws concerning the export of controlled or protected technologies or information (collectively, “Export Control Laws"). Any offer of employment will be contingent on the need for compliance with such Export Control Laws.

About Commonwealth Fusion Systems

Commonwealth Fusion Systems is on a mission to deliver the urgent transition to fusion energy.

Combining decades of research, top talent, and new technologies, we’re designing and building commercially viable fusion power plants. And we're working with policymakers, suppliers, and many others to build the energy industry of the future.

We’re in the best position to make it happen. Since 2018, we’ve raised $4 billion of capital, making us the largest and leading fusion company in the world.

Now we’re looking for more thinkers, doers, builders, and makers to join us. People who’ll bring new perspectives, solve tough problems, and thrive as part of a team.

If that’s you and this role fits, we want to hear from you.

Join the power movement as a Senior Mechanical Engineer

We’re looking for a Senior Mechanical Engineer to join our R&D and equipment design team to help build the next generation of thin-film deposition technology. The Senior Mechanical Engineer will be responsible for the design and implementation of advanced R&D equipment and complex machinery.

This role requires strong technical expertise, procedural discipline, and the ability to collaborate across engineering and technology functions to ensure safe, reliable, and high-performance equipment. If you enjoy working on complex design problems, mentoring others, and solving problems in a collaborative, fast-paced environment, this is your opportunity to make an impact.

Equal opportunity and legal notices

We value diversity deeply and are proud to be an equal opportunity employer by choice. We consider all qualified applicants equally, regardless of race, color, national origin, ancestry, citizenship status, protected veteran status, religion, physical or mental disability, marital status, sex, sexual orientation, gender identity or expression, age, or any other basis protected by law.

Read the original posting

From Commonwealth Fusion Systems's careers page, first listed on Rolev.ai on October 26, 2026. Rolev.ai is not the employer.

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Common questions

Where is the Senior Mechanical Engineer job at Commonwealth Fusion Systems located?

This Senior Mechanical Engineer position at Commonwealth Fusion Systems is located in Milpitas, CA (On-site). Always check Commonwealth Fusion Systems's application page for specific state eligibility or relocation policies.

What qualifications are required for Senior Mechanical Engineer at Commonwealth Fusion Systems?

For the Senior Mechanical Engineer role, Commonwealth Fusion Systems highlights 8+ years of relevant experience; a bachelor's degree; experience with 3D modeling, FEA tools (COMSOL, ANSYS, or equivalent), mechanical design of R&D systems and manufacturing equipment, vendor selection and qualification, design reviews, technical documentation. Rolev.ai can score your existing resume against these requirements and show any skill gaps before you apply.

How do I apply for the Senior Mechanical Engineer position at Commonwealth Fusion Systems?

This listing links directly to Commonwealth Fusion Systems's Lever application page. You can apply directly on Commonwealth Fusion Systems's site, or use Rolev.ai to check your resume fit, generate a zero-hallucination tailored resume and cover letter for this posting, and autofill the Lever application form in 1 click with the Rolev.ai Chrome extension. You always review the form and press Submit yourself.

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