Welder - Weekend - First Shift
Commonwealth Fusion Systems
Company Overview
Commonwealth Fusion Systems (CFS)
Cambridge, MA, United States
2018
Approximately 430 employees (source: zoominfo.com). Revenue figures vary, with reports indicating $211.3 million or $31.7 million, though as a pre-revenue fusion developer focused on R&D, these may reflect funding or operations rather than sales.
What They Do
Commonwealth Fusion Systems (CFS) is a pioneering private fusion energy company that specializes in tokamak-based magnetic confinement fusion. Founded as a spinout from MIT's Plasma Science and Fusion Center, CFS focuses on utilizing high-temperature superconducting magnets to achieve commercial net energy production (source: cfs.energy). The company has made significant strides in its technology, particularly with the development of compact fusion machines that leverage decades of tokamak science. Their flagship projects, SPARC and ARC, aim to demonstrate net energy gain and commercial viability in the coming years (source: cfs.energy).
Projects & Track Record
CFS is currently engaged in several groundbreaking projects, most notably the construction of SPARC, which is set to be the world's first net-energy fusion machine. Located at their Fusion Energy Campus in Devens, Massachusetts, SPARC aims to demonstrate net energy gain by the late 2020s (source: cfs.energy). Additionally, CFS is planning the ARC project, a 400 MW-class grid-scale tokamak power plant designed for commercial deployment in the early 2030s. These projects are underpinned by significant technological advancements, including the successful testing of the central solenoid magnet module (CSMC) in November 2024, which confirmed the manufacturability of critical components for SPARC (source: zoominfo.com).
Recent Developments
In the past two years, CFS has made remarkable progress, including the opening of its Devens Fusion Energy Campus on February 10, 2023, which was attended by notable figures such as U.S. Secretary of Energy Jennifer Granholm (source: cfs.energy). The company has also secured substantial funding, raising $863 million in August 2024, building on a previous $1.8 billion round in May 2023, bringing total funding to over $2 billion (source: wbjournal.com). Furthermore, CFS announced its first commercial power plant site in Chesterfield County, Virginia, which will be independently financed and operated, with plans for grid connection in the early 2030s (source: zoominfo.com).
Working There
CFS offers a range of roles across various disciplines, including fusion science, engineering, manufacturing, and materials science. The majority of their workforce is based at the Devens campus, which has grown to over 430 employees (source: cfs.energy). The company culture emphasizes rapid execution and transparency, attracting top talent from the fusion and manufacturing sectors. Key executives include Co-Founder and CEO Bob Mumgaard, along with other leaders in operations and science, indicating a strong demand for expertise in tough tech and physics (source: nasdaqprivatemarket.com). While specific benefits are not detailed, the scale-up and investor backing suggest competitive packages for high-caliber roles in a mission-driven environment (source: cfs.energy). Job seekers are encouraged to monitor their careers page for openings related to SPARC and ARC advancements.
Contact
Last updated on 2026-01-02 | Report an issue
Job Description
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 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 Production Welder
This individual is responsible for performing manufacturing in-house welding work for cutting edge high-field superconducting magnets.
Hours: 6:00 am - 6:00 pm
Work Saturday, Sunday, Monday
Rate of pay: $30 - $41 per hour + 15% differential
What you'll do
- Weld and inspect large metallic structures and tooling within specified timelines and budgets
- Set up welding processes as per specifications, incl. determining the correct equipment to use and methods based on the requirements
- Read and analyze drawings and take detailed measurements to plan the project layout
- Cut and join material
- Perform hand welding or semi-automated welding. Utilize advanced forms of welding when needed. Weld components in vertical, flat, and overhead positions
- Provide manufacturability feedback to design engineers for weld geometries and material selection
- Perform welding equipment qualification trials
- Troubleshoot and resolve manufacturing discrepancies with a focus on continuous improvement
- Follow safety procedures at all times
What we're looking for
- Documented Training or Certification in most of the following: Blueprint Reading and Fabrication, Gas Metal Arc Welding (GMAW), Gas Tungsten Arc Welding (GTAW), Advanced Shielded Metal Arc Welding (SMAW)
- 5+ years' experience as a welder on large structural systems and tooling
- Experience with large metallic structures and manufacturing processes related to welding
- Experience in producing welds to pass industry standard requirements
- Experience welding stainless steel
- Experience using GTAW process to weld copper
Bonus points for
- Experience in welding for pressure vessel, aerospace, and/or nuclear applications
- GTAW, GMAW, SMAW, Electron Beam and Laser Welding Experience
- Experience operating mechanized or automated welding equipment
- The ability to read and interpret technical drawings and documentation
- Excellent attention to detail
- Knowledge of various forms of welding equipment and procedures
- The capacity to work unsupervised
- A detailed understanding of mathematical and numerical data and calculations
- Project and time management
Must-have requirements
- Ability to lift up to 50 lbs regularly
- Perform activities such as stooping, typing, standing, and 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 occasionally or do required nights/weekends/on-call
$30 - $41 an hour
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
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.
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About the role
January 20, 2026
Full Time
Company
January 20, 2026
On-site
USD 30–41 per hour
- Devens, Massachusetts, United States
5+ years
UTC-05:00
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