Lead Production Welder
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 2026-02-12 | Report an issue
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 Lead Production Welder
The Lead Production Welder at Commonwealth Fusion Systems is responsible for leading a highly skilled and efficient team welding the world's strongest high temperature superconducting magnets and assemblies for integration into CFS fusion devices. The role is responsible for continuously improving production welding tasks, maintaining schedules with resourcing, and assuring quality requirements are met per documentation. The welding team is a hands-on build team working with mechanical, electrical, magnetic, cryogenic, pressure, vacuum, and pneumatic systems.
What you'll do
- Support production welding operations including coordinating welding operations, maintaining welder continuity, supporting first encounters, planning and execution of weld repairs, and process improvement projects
- Advise and monitor welder safety
- Provide weldability/manufacturability feedback to engineers for drawings, weld geometries, and tool access
- Train & certify welders to meet Production needs, provide technical guidance, and maintain records of welder certification
- Review and prepare welding instructions to ensure welders are familiar with the requirements and equipped to meet them
- Define and standardize welding best practices across CFS Production
- Implement welder feedback into welding procedures and work instructions
- Standardize and manage weld consumables, production weld equipment
What we're looking for
- High school Diploma
- 5+ years experience as a welder and/or welding operator in a manufacturing environment or on large structural systems and tooling
- Understanding of weld drawings, symbols, terminology, and specifications
- Familiarity with welding standards, including ASME BPVC Sec IX, ASME B31.1, AWS D1.1
- Knowledge of safety requirements and practices, particularly as they relate to joining applications
- Familiarity with welding, brazing, cutting equipment, theory, and application
- Familiarity with Welding Inspection techniques, including visual inspection (VT), X-ray inspection (RT), dye penetrant (PT), ultrasonic inspection (UT), and magnetic particle testing (MT)
- Familiarity working with stainless steel, aluminum, copper, refractory and nickel based alloys
- Knowledge of Base Material and Welding Materials, including a basic understanding of welding metallurgy, weldability characteristics of base and filler metals
- Proficiency with GMAW, GTAW, SMAW, FCAW processes and semi-automatic, mechanized and robotic equipment
- Ability to obtain professional certifications such as AWS Certified Welding Inspector
Bonus points for
- Knowledge of material testing methods and material specifications
- Experience with LBW, OTW, brazing, soldering, and automated welding processes
- Previous experience in a welding supervisory or management position
- Strong problem solving skills, ability to approach new problems with creativity
- Ability to work effectively in a multidisciplinary team of engineers, scientists, technical staff, and others
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 - $50 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
- 12.5 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
February 13, 2026
Full Time
Company
- Devens, Massachusetts, United States
5+ years
UTC-05:00
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