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Salary
$146k – $210k per year
Location
In office (Milpitas)
Seniority
Senior · 8+ years exp
Employment
Full-Time

Confirmed on the employer's own hiring board on Oct 21, 2026. First seen by Alion on Oct 16, 2026. Commonwealth Fusion Systems scores A on the Alion truth index.

Overview
Company
Impact
Profile match
Commonwealth Fusion Systems is a commercial fusion energy company headquartered in Devens, Massachusetts, and founded in 2018. The firm specializes in the development of high-temperature superconducting magnets and compact tokamak devices, specifically the SPARC net-energy machine and the ARC commercial power plant. It operates through a strategic partnership with the Massachusetts Institute of Technology and focuses on scaling fusion technology to provide carbon-free, baseload power to global energy markets.

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.

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
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