Mechanical Engineer
Commonwealth Fusion Systems
Devens, MA, USA
USD 90k-145k / year
Posted on May 18, 2026
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 and suppliers to build the energy industry of the future.
We’re in the best position to make it happen. Since 2018, we’ve raised nearly $3 billion in capital, making us the largest and leading private 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 Mechanical Engineer
We are seeking a Mechanical Engineer to focus on the integration of design and manufacturing engineering. The successful candidate will be part of the team that implements first of a kind superconducting magnet designs into a production line. This role is part of the magnet design group and acts as that group’s liaison to production staff. This role requires close collaboration with other design engineers, as well as with manufacturing, quality, supply chain, R&D, and equipment engineers.
What you'll do:
- Provide on-floor, hands-on manufacturing support for pilot and production lines
- Assess the producibility of designs and provide continuous design improvement
- Update design documentation with feedback from prototype and pilot builds
- Assess non-conformances
- Participate in root cause investigations
- Suggest and lead prototyping efforts that reduce risk during manufacturing start-up
- Create standard procedures and contribute to the creation of work instructions
- Organize and lead design for manufacturing reviews
- Work with production teams to improve process and/or equipment
What we're looking for:
- BS in technical field - Mechanical Engineering or equivalent (ex. Manufacturing, Aerospace, Industrial, Materials, etc)
- 4+ years' experience in mechanical, manufacturing, or quality engineering
- Strong communication and collaboration skills
- Strong analytical and problem solving skills
Bonus points for:
- Basic CAD skills (NX preferred, any acceptable)
- Expertise in AMSE Y14 GD&T principles
- Experience in a production environment
- Design experience of large industrial equipment
- Design experience with any of the following:
- Composite materials
- Welding
- Vacuum systems
- Knowledge of Lean or Six Sigma principles
- Knowledge of quality systems and formal RCCA processes
Must-have requirements:
- Ability to lift up to 50 lbs occasionally
- Perform activities such as typing, standing, stooping, and sitting, for extended periods of time
- Willingness to occasionally travel or work required nights/weekends/on-call
- Dedication to safety to mitigate hazards that may include heat, cold, noise, fumes, strong magnets, lead, high voltage, and cryogenics
#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.
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.
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.
90000 - 145000 USD a year