Subassemblies Technician
Devens, MAFull-time$30–52/hrPosted 1 day agoStill listed 1 day ago
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At a glance
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Job overview
Commonwealth Fusion Systems is hiring a Subassemblies Technician to build precision, ultra-high-vacuum components for the SPARC Tokamak. The technician will test assemblies, collaborate with scientists and engineers, and support alignment, installation, cleanliness, and resolution of field non-conformances. The role seeks extensive technical assembly experience and offers hands-on work supporting the development of fusion energy.
Skills & qualifications
Skills
Qualifications
Benefits
Full 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, 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 Technician 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. 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:
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Build complex and simple subassemblies and components while maintaining all cleanliness specification
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Perform testing and check-outs with helium leak checking and various other check-out equipment
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Work together with scientists and engineers to ensure assemblies are meeting their design intent
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Assist with precision alignment and installation of active and passive optical systems
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Actively participate in maintaining mandatory cleanliness of work area and clean room
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Participate in first encounter reviews to quickly overcome non-conformances encountered in the field
What we’re looking for:
- High school diploma or equivalent experience
- 7+ years in a highly technical assembly role; e.g., aerospace/aircraft, racing, semiconductor, oil & gas, laboratory, wind, automotive
- Learns from mistakes and builds from them
- Can operate a forklift
- Experience building Intricate projects end to end
- Ability to use basic machining tools; e.g., lathe/mill
- Experience using measurement tools
- Experience rigging and lifting heavy components
- Highly self-motivated, organized, and passionate about their work and curious about what we are building
- Willingness to push through long hours when needed and open to learning new skills
Bonus points:
- Soldering experience
- Knowledge of clean room best practices
- Knowledge of cryogenic systems
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
#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.
30 - 52 USD
Salary range for this full-time position + equity + benefits. The actual salary will depend on level, location, qualifications, and experience. The range displayed on each job posting reflects new hire salaries for the position across all US locations. Benefits include:
- Competitive compensation with equity
- 13 Company-wide Holidays
- Flexible vacation days
- 10 sick days
- Generous parental leave policy
- Health, dental, and vision insurance
- 401(k) with employer matching
- Professional growth opportunities
- Team-building activities
How this job compares
Set against the 5,871 open Technician jobs on Olive Jobs, counted November 4, 2026.
- Pay
- This posting$30–52/hr
- Massachusetts median$26–38/hr81 hourly ranges
- US median$24–35/hr2,698 hourly ranges
This range's midpoint, $41/hr, is 26% above the Massachusetts median midpoint ($33/hr) — in the top quarter of Technician hourly ranges in Massachusetts.
- Openings
- Olive Jobs lists 114 open Technician jobs in Massachusetts and 5,871 across the US. Under 1% of them nationwide are listed as remote or flexible.
- Hiring the most in Massachusetts
- Beth Israel Lahey Health11 open
- Brunswick4 open
- Commonwealth Fusion Systems (this employer)4 open
- Experience
- This posting asks for at least 7 years of experience — more than three in four Technician postings that state a minimum ask for (median 2 years, across 2,891 postings).
- Education
- 119 of the 5,871 open Technician jobs (2%) ask for a bachelor's degree or higher.
Counted across the open, public US postings on Olive Jobs on November 4, 2026. Pay medians are the middle values of the low ends and of the high ends of postings that list both ends of a range in the same cadence (a yearly salary or an hourly rate); a range's midpoint is halfway between its ends. Pay and experience figures resting on fewer than 20 postings are left out.
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