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Commonwealth Fusion Systems

Intern - Materials Test Engineer (m/w/d)

Become a Materials Test Engineering Intern with Commonwealth Fusion Systems in Devens, Massachusetts. Support the development and testing of advanced materials for fusion energy systems in a collaborative R&D environment. Enjoy competitive pay, health benefits, and professional growth opportunities during this 26-week internship.
Commonwealth Fusion Systems
Commonwealth Fusion Systems
Devens, Massachusetts, United States On-site Internship USD 23–35 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 2026-02-23 | Report an issue

Program Details

  • 26 week internship
  • 40-50 hours per week with set hourly salary based on year in school
  • Opportunities onsite in Devens, MA. If an intern is going to be on site, you will be responsible for your own transportation and housing
  • Specific project assignments and required technical skillset will vary based on the team's existing need
  • Opportunities available for currently enrolled college students in all levels of schooling from bachelor's degree to PhD
  • Interns must be authorized to work in the United States for any employer

What you'll do

  • Support day-to-day operations and test development work in the Materials Test Lab, including sample preparation, test execution, data collection, and analysis
  • Work alongside engineers and technicians to enable material performance evaluation for critical fusion components
  • Contribute to custom test development projects
  • Example projects may include: Assisting with the design and build of high-temperature outgassing test stand, commissioning and calibration of new test equipment, improving lab workflows for repeatability and turnaround time, development of capabilities for mechanical testing of composite materials using existing Instron test frames

What we're looking for

  • Interest or experience with materials science, metallurgy, mechanical engineering, mechanical testing, electrical engineering, physics, chemistry, nanoscience, microscopy, engineering lab work, or instrumentation
  • Hands-on or engineering project experience or hands-on experience with materials testing and characterization equipment and testing procedures is preferred
  • Demonstration of exceptional results through a range of different pursuits
  • High self-motivation and drive to execute quickly with excellent troubleshooting/problem-solving skills

Must-have Requirements

  • Willingness to travel or work required nights/weekends/on-call occasionally
  • 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, and cryogenics

$23 - $35 an hour

Rates are aligned to your current year in school, ensuring equitable and consistent pay across our intern program.

For BS interns, the hourly rate is $23-$29

For MS/PhD interns, the rate is $32-$35

Benefits included for full-time interns:

  • 40 hours of sick time
  • Health, dental, and vision insurance
  • 401(k) with employer matching (must be 21 years of age to enroll)
  • 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 27, 2026

Internship

Company

March 1, 2026

On-site

USD 23–35 per hour

Hydrogen

Commonwealth Fusion Systems

cfs.energy

  •  Devens, Massachusetts, United States

Currently enrolled college students from bachelor's to PhD

UTC-05:00