Commonwealth Fusion Systems

Materials Test Operator - Second Shift

Join Commonwealth Fusion Systems in Devens, Massachusetts as a Materials Test Operator on second shift. This role involves preparing test specimens, conducting mechanical and materials characterization tests, and supporting lab operations. Enjoy working in a fast-paced fusion energy company with opportunities for growth and a focus on safety and innovation.
Commonwealth Fusion Systems
Commonwealth Fusion Systems
Devens, Massachusetts, United States On-site Full time USD 30–45 per hour UTC-05:00

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.


Last updated on Feb 23, 2026 | 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 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.

What you'll do

  • Prepare test specimens and performs laboratory experiments
  • Conduct continuous improvement in the materials test and characterization laboratory
  • Support inventory management on consumable/spare parts and report up for purchasing
  • Execute materials tech tickets in accordance with the standard operating procedures and job hazard analyses
  • Operate industry standard and customized materials testing and characterization equipment, processes, and test methods
  • Conduct materials testing independently under the input from a materials test engineer including data management and reporting
  • Complete mechanical testing including tensile testing, shear testing, fatigue testing, fracture toughness testing and other custom testing in extreme environments of cryogenic temperatures and high temperatures
  • Complete materials characterization including metallographic sample preparation (cutting, grinding, polishing), microscopy and imaging, hardness testing, magnetic and electrical testing.
  • Support installing, maintaining and troubleshooting laboratory equipment for effective usage as needed
  • Have the ability and desire to work on multiple, different assignments
  • Have the flexibility to adapt to changes in lab operations, priorities, and schedules
  • Maintain proper documentation with attention to detail
  • Be comfortable with performing repeated tests while still maintaining test quality
  • Perform other related job duties as assigned by management

What we're looking for

  • High school diploma/equivalency certificate or higher
  • Minimum 2 years experience with with basic materials prep and testing tools
  • Minimum 2 years experience with a variety of technical support skills including but not limited to mechanical and electrical assembly, vacuum systems, cryogenic systems, soldering, and wiring
  • Participate in and promote CFS' safety procedures and policies
  • Desire to work in a fast-paced R&D environment with daily changes
  • Meticulous attention to detail
  • Ability to work effectively in a multidisciplinary team of engineers, scientists, technical staff and others
  • Ability to rapidly execute short turnaround materials testing tasks
  • Strong problem solving skills, ability to approach new problems with creativity
  • Strong written and oral communications skills & techniques.
  • Effective root cause analysis and problem-solving skills
  • Proficient PC skills (Microsoft Word, Excel, PowerPoint)
  • Ability to work independently and in a team environment
  • Ability to comply, interpret and support procedures, work rules, and protocols

Bonus points for

  • Experience with Instron-based mechanical test systems, Bluehill and Wavematrix software is a plus
  • Testing to industry or international standards
  • Experience operating tensile load frames, strain gauges
  • Experience as a microscopist (optical or electron)
  • Experience using electrical test devices
  • Experience with metallographic sample preparation and analysis
  • Experience with hazardous chemical use and management
  • Experience with vacuum systems
  • Experience operating shop equipment including horizontal band saws, drill presses, grinders/sanders, etc
  • Ability to follow engineering procedures and instructions
  • Understands materials testing and characterization equipment operations and processes.
  • Experience working with cryogens such as Liquid Nitrogen and Liquid Helium

Must-have Requirements

  • Ability to occasionally lift up to 50 lbs
  • Perform activities such as typing, standing, or 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, metallographic Etchants and cryogenics
  • Willingness to travel or work required nights/weekends/on-call occasionally

$30 - $45 an hour

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

June 18, 2026

Full time

Company

June 19, 2026

On-site

USD 30–45 per hour

Hydrogen

Commonwealth Fusion Systems

cfs.energy

  •  Devens, Massachusetts, United States

Minimum 2 years

UTC-05:00