← Back to jobs

Subassemblies Specialist
Posted 2 hours ago• Technician
Compensation
$90,000–$145,000/year
Job Description
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 Subassemblies Specialist
The Subassemblies team is responsible for delivering precision, ultra high vacuum subassemblies for seven major teams that go into the SPARC Tokamak. As a Subassemblies Specialist, you will be the last set of hands and eyes on critical parts; as such, meticulous attention to detail in build quality is necessary. You will draw upon your years of technical experience building complex systems to help streamline workflows and deliver the best possible parts. Once all the subassemblies are built (roughly a two year timeline) you will be uniquely qualified to install the subassemblies into the Tokamak and your role will transition to the Assembly of the machine. This role is truly a once in a lifetime opportunity to use hands-on assembly skills to accelerate the development of fusion energy by ensuring SPARC is built on time and to high quality. The main systems you will be building are high power RF antennas, plasma facing components, port plugs, error field correction coils, vertical stability coils and plasma diagnostics; the bespoke tools used for real-time control of a burning plasma and to achieve SPARC's science mission.
What you'll do:
What we’re looking for:
Bonus points:
Essential Requirements:
#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.
Optimize Your Resume for This Job
Get a match score and see exactly which keywords you're missing
Job Details
- Category
- Technician
- Employment Type
- Contract
- Location
- Devens, MA
- Posted
- May 11, 2026, 03:50 PM
- Listed
- May 11, 2026, 04:10 PM
- Compensation
- $90,000 - $145,000 per year
About Commonwealth Fusion Systems
Part of the growing frontier tech ecosystem pushing the edges of what's possible.
More Roles at Commonwealth Fusion Systems

Commonwealth Fusion Systems
Technician
Fiber Optic Specialist
Devens, MA$30 - $48/hour Full Time
5 hours ago
Technician
5 hours ago
Commonwealth Fusion Systems
Technician
Process Technician
Milpitas, CA$35 - $50/hour Full Time
6 hours ago
Technician
6 hours ago
Commonwealth Fusion Systems
Business & Finance
Senior Financial Analyst
Devens, MA$110K - $185K Full Time
3 days ago
Business & Finance
3 days ago
Commonwealth Fusion Systems
Technician
Production Technician - Second Shift
Devens, MA$30 - $41/hour Full Time
3 days ago
Technician
3 days ago
Commonwealth Fusion Systems
Business & Finance
Director, Enterprise Applications
Devens, MA$170K - $250K Full Time
3 days ago
Business & Finance
3 days agoSimilar Technician Roles

Nuro
Technician
On-Site Hiring Event: Autonomous Vehicle Operator, Santa Clara (12-Month Duration)
Santa Clara, CA$27/hour Contract
33 minutes ago
Technician
33 minutes ago
Duranium
Technician
Process Engineering Technician
Oakland, CA$105K - $130K Full Time
2 hours ago
Technician
2 hours ago
Pave Robotics
Technician
Founding Fabrication Technician
San Francisco, CA$80K - $120K Full Time
2 hours ago
Technician
2 hours agoFound this role interesting?
Subassemblies Specialist
Commonwealth Fusion Systems