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Commonwealth Fusion Systems

Manager, Fusion Diagnostics

Become the Manager of Fusion Diagnostics at Commonwealth Fusion Systems in Devens, Massachusetts. Lead a team in developing ionizing radiation diagnostics for fusion energy, ensuring project milestones are met. Enjoy competitive compensation, flexible vacation days, and professional growth opportunities.
Commonwealth Fusion Systems
Commonwealth Fusion Systems
Devens, Massachusetts, United States   On-site   Full Time   USD 150k–225k yearly  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.

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 Manager, Fusion Diagnostics

The SPARC Diagnostics Team is divided into three instrumentation specialist teams to facilitate the deployment of diagnostics and the development of staff. This role focuses on SPARC's ionizing radiation diagnostics which are the tools that measure neutron, gamma, X-ray and vacuum ultraviolet emission from the plasma. This includes the measurements that will be used to achieve CFS's nearest milestone, to demonstrate Q > 1 in SPARC's first operational campaign. A more detailed overview of SPARC's diagnostics can be found at: https://pubs.aip.org/aip/rsi/article/95/10/103518/3317155.

The Manager is expected to provide leadership to scientists and engineers as well as carry out some responsibilities of an individual contributor on an as needed basis. The role will evolve with the SPARC project as diagnostics move from design to operation, but is envisioned to have the responsibilities listed below. Candidates will work as part of an integrated diagnostic team that includes MIT-PSFC partners and fusion community collaborators from around the world. Experience working on a tokamak or with fusion plasma diagnostics is not required and CFS welcomes applications from non-tokamak or non-fusion backgrounds that can help deliver SPARC's diagnostic capabilities.

What you'll do

  • Support and strengthen the ionizing radiation diagnostics team, presently consisting of the instrumentation leads, engineers and designers
  • Provide leadership to ensure the team's completion of the design, procurement and assembly of the SPARC's ionizing radiation diagnostics (neutron, gamma, X-ray and vacuum ultraviolet spectroscopy)
  • Identify paths to reduce the complexity in SPARC diagnostics through shared design solutions or re-evaluation of potentially conservative requirements
  • Assist the Diagnostic Team Lead in managing scope, budget, schedule and technical risk
  • Manage space in the SPARC Diagnostic Labs and work with procurement to tailor QA/QC and inventory control to the specific needs of ionizing radiation diagnostics
  • Help develop and review plans for integration of ionizing radiation diagnostics into SPARC's real-time and day-to-day control systems
  • Help to ensure the efficient operation and use of SPARC's ionization radiation diagnostics to achieve SPARC's scientific mission
  • Supervise a team of ~10 engineers and scientists

What we're looking for

  • Bachelor's degree in a relevant engineering field (mechanical, aerospace, civil or nuclear), with advanced degrees improving the job execution
  • Have developed and delivered scientific or industrial instrumentation that utilized ionizing radiation
  • Understand the basics of ionizing radiation and relevant safety issues in order to ensure these concepts are embedded in design
  • Prior experience with line management is encouraged but not required, but all candidates must demonstrate clear leadership experience, e.g. leading a team to accomplish a goal/mission or to deliver a product
  • Ability to direct staff accomplishing complex tasks over a broad range of topics
  • Experience responsibly managing a budget at or above the million dollar level

Must-have requirements

  • Ability to occasionally lift up to 50 lbs
  • Perform activities such as typing, standing, or sitting for extended periods of time
  • Willingness to travel or work required nights/weekends/on-call occasionally
  • Work in a facility that contains industrial hazards including heat, cold, noise, fumes, strong magnets, lead (Pb), high voltage, high current, pressure systems, and cryogenics

$150,000 - $225,000 a year

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

December 2, 2025

Full Time

Company

January 9, 2026

On-site

USD 150k–225k yearly

Commonwealth Fusion Systems

cfs.energy

  •  Devens, Massachusetts, United States

Bachelor's degree with leadership experience preferred

UTC-05:00

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