Director of Radiation Protection
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.
Join the power movement as a Director of Radiation Protection
The Director of Radiation Protection, who also serves as the Radiation Safety Officer (RSO), is a key member of the Environmental Health, Safety, and Security (EHSS) leadership team. This individual is responsible for the overall leadership, strategic direction, and long-term success of CFS's comprehensive Radiation Protection program. They will champion a strong safety culture throughout the organization, and work with leaders across EHSS and all departments to develop and implement a holistic and proactive approach to safety.
What you'll do
- Radiation Protection Leadership: Serve as the Radiation Safety Officer (RSO) for the CFS Broad Scope License and provide leadership in all areas radiation is used
- Develop Radiation Protection Program: Responsible for the development of CFS Radiation Protection Program areas in accordance with state and federal radiation regulations, with oversight from the Radiation Safety Committee.
- Lead and manage Radiation Protection Team: Responsible for the recruitment, selection, management, development and assessment of Radiation Protection staff.
- Manage and Assess the Radiation Protection Program: Responsible for the technical adequacy of all program operations. Ensures the program is performed in accordance with Standard Operating Procedures, Licensing Commitments, and Regulatory Requirements. Performs or oversees annual program assessments.
- Hazard Risk Investigation and Response: Conduct incident and exposure investigations, and develop corrective actions plans. Ensure that appropriate follow-up is completed, recorded, and reported to the Radiation Safety Committee and/or regulatory authorities.
- Monitor and Report on Radiation Protection Program Operations: Responsible for preparing reports and maintaining records of program operations in a form suitable for inspection by regulatory agencies.
- Liaise with Regulatory Agencies and Professional Societies: Participate in the work of professional societies and governmental agencies in standards setting, education and regulatory development related to Radiation Protection. Stay apprised of proposed and upcoming regulatory changes and their potential impact on fusion and the CFS License. Responsible for all radiological correspondence with state and federal agencies including.
- Community Outreach: Support outreach efforts by representing CFS at various community and/or business meetings, committees, and task forces.
- Formulate Direction and Strategy: Plan and implement short and long-term strategy and direction for the Radiation Protection Program consistent with overall EHSS mission and strategic goals.
- Financial Budgeting and Control: Prepare and track budget and staffing levels for program operations.
- Maintain Knowledge of the whole EHSS Program: Understand the structure and function of all areas of EHSS. Maintain familiarity with, lead, and participate in emergency cross training procedures.
- Support Cross-functional Partnerships: Lead or support cross-functional teams, special projects, and performs other duties as assigned
What we're looking for
- Bachelor's or graduate degree in physical science, engineering, or biological science.
- 10+ years management experience, 15+ years of professional experience in health physics including at least 5+ years in applied health physics with responsibility for a major program in radiological health
- Experience working under and applying radiation regulations, specifically 105 CMR 120/10 CFR 30 (or equivalent)
- Experience applying a variety of radiation monitoring techniques to different situations
- Experience writing procedures, work plans, or technical documents
Bonus points for
- Experience with gram quantities of tritium (either use or oversight)
- Experience working under a broad scope license
- Experience with radiation facility lifecycle - design, licensing, operation, and decommissioning.
- CHP (Certified Health Physicist)
- Knowledge of radiation control, radiological health, environmental laws and regulations, and radiation safety practices and techniques
- Strong interpersonal and communication skills and the ability to work effectively with a wide range of constituencies in a diverse community as well as foster a cooperative work environment.
- Strong project management skills
- Strong time management and organizational capabilities
- Adept at risk assessment, problem-solving, and critical thinking
- Ability to translate complex technical concepts for diverse audiences
- Capable of inspiring change, mentoring colleagues, and driving continuous improvement in a lean, fast-paced environment
Must-have requirements
- Ability to occasionally lift up to 50 lbs
- 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
- Perform activities such as stooping, climbing, typing, standing, or sitting for extended periods of time
- Willingness to travel or work required nights/weekends/on-call occasionally
$170,000 - $250,000 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
- 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.
Apply now
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Apply now
Job expired?Please let Commonwealth Fusion Systems know you found this job on Rejobs. This will help us grow and get more people to work on renewable energy!
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About the role
April 30, 2026
Full time
Company
- Devens, Massachusetts, United States
15+ years of professional experience with 10+ years in management
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