Subassemblies Specialist
- Location
- Devens, MA · On-site
- Job type
- Full-time
- Level
- Senior
- Experience
- 5+ years
- Listed
- 14 days ago
Skills & highlights for this role
- Technical hands-on assembly
- Precision measurement tools
- Helium leak checking
- Forklift operation
- Rigging and lifting heavy components
- Experience with tracking software (JIRA, Manufacturo, or similar)
- Tooling design
- Basic machining tools (lathe/mill)
- Team leadership (4+ people)
- End-to-end large-scale project experience
Also useful
- Welding
- Cleanroom best practices
- Cryogenic systems knowledge
- Six Sigma
What you'll do
- Build complex and simple subassemblies and components while maintaining all cleanliness specifications
- Oversee contract technicians; ensuring they are following work instructions and are delivering quality parts
- Perform testing and check-outs with helium leak checking and various other check-out equipment
- Work together with scientists and engineers to refine work instructions
- Help to finalize design of components that interact with the tooling
- Assist with precision alignment and installation of active and passive optical systems
- Actively participate in maintaining mandatory cleanliness of work area and clean room
- Assist other CFS teams with related skilled work
- Participate in developing strategies to quickly overcome non-conformances encountered in the field
What we’re looking for
- High school diploma or equivalent experience
- 5-7 years in a highly technical assembly role; e.g., aerospace/aircraft, racing, semiconductor, oil & gas, laboratory, wind, automotive
- 2 years leading a team of four people or more
- Can operate a forklift
- Experience creating designs for tooling
- Experience completing large scale projects end to end
- Ability to use basic machining tools; e.g., lathe/mill
- Experience using measurement tools
- Experience using JIRA, Manufacturo, or other software based tracking
- Experience rigging and lifting heavy components
- Highly self-motivated, organized, and passionate about their work
Bonus points
- Welding experience
- Knowledge of clean room best practices
- Knowledge of cryogenic systems
- Knowledge of six sigma process
Essential Requirements
- Ability to occasionally lift up to 50 lbs
- Ability to perform activities such as sitting, climbing, stooping, typing, and standing for extended periods of time
- Willingness to occasionally travel for required nights/weekends/on-call
- Dedication to safety to mitigate industrial hazards that may include heat, cold, noise, fumes, strong magnets, lead (Pb), high voltage, and cryogenics
Additional information
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 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.
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.
From Commonwealth Fusion Systems's careers page, first listed on Rolev.ai on October 26, 2026. Rolev.ai is not the employer.
How Rolev.ai helps with this application
Rolev.ai is a job search and application tool for US job seekers. For this Subassemblies Specialist role at Commonwealth Fusion Systems, it shows how your resume fits, tailors your resume to the posting, and prepares the application for you to review.
See how you fit
Openings from employer career sites are ranked against your whole resume—and searchable inside Claude, ChatGPT, and Cursor via Rolev.ai MCP.
Tailor without inventing
Every change to your resume is checked against your original. New experience goes in only with your yes—zero fabricated claims.
Draft the full kit
Tailored and Full Match resumes, role-specific cover letters, and answers to employer screening questions are prepared in seconds.
1-Click Extension Autofill
The Chrome extension fills the employer's Greenhouse, Workday, Lever, or Ashby form in 1 click. You review it and press Submit.
Common questions
Where is the Subassemblies Specialist job at Commonwealth Fusion Systems located?
This Subassemblies Specialist position at Commonwealth Fusion Systems is located in Devens, MA (On-site). Always check Commonwealth Fusion Systems's application page for specific state eligibility or relocation policies.
What qualifications are required for Subassemblies Specialist at Commonwealth Fusion Systems?
For the Subassemblies Specialist role, Commonwealth Fusion Systems highlights 5+ years of relevant experience; experience with Technical hands-on assembly, Precision measurement tools, Helium leak checking, Forklift operation, Rigging and lifting heavy components, Experience with tracking software (JIRA, Manufacturo, or similar). Rolev.ai can score your existing resume against these requirements and show any skill gaps before you apply.
How do I apply for the Subassemblies Specialist 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.