Intern - Nuclear/Systems Engineer - Summer 2027
at Commonwealth Fusion Systems
Location
Devens, MA
Compensation
$52k–$79k USD
Type
intern
Posted
2 weeks ago
Market range · company + function + seniority
$160k—$205k—$210k
p25 · target · p75 · n=13
Posted $79k · well below market
Tailor your résumé to this role in 30 seconds.
Free account · ATS keyword check · per-job bullet rewrite by Claude.
Job description
About Commonwealth Fusion Systems:
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, suppliers, and many others to build the energy industry of the future.
We’re in the best position to make it happen. Since 2018, we’ve raised $4 billion of capital, making us the largest and leading 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 Nuclear/Systems Engineering Intern
We are looking for a talented Nuclear/Systems Engineering Intern to join our team! CFS interns are highly valued within the organization and placed into meaningful and challenging roles.
Program Details:
What you'll do:
- The Nuclear/Systems Engineering Intern will support the interface of Nuclear Engineering and Systems Engineering working collaboratively with both teams on neutronics analyses and their application to the development of system design.
- The intern will work on projects such as, but not limited to: participating in Hazard Identification reviews and evaluation of accident scenarios, development and verification of radiation related system requirements, and margin budget development, tracking, and support
What we’re looking for:
- Pursuing an engineering degree with focus in the fields of Nuclear Engineering or Mechanical Engineering
- Have complete by the start of their internship Neutron Transport or Neutronics or a Reactor Theory course
- Experienced in MCNP or OpenMC
- Experience in Mechanical Design through courses, previous internships, or class projects
- Strong communication skills and a willingness to learn Must work well in a team
- Must be highly self-motivated and driven to execute quickly with excellent troubleshooting/problem-solving skills
- Optional: experienced in CAD and/or Python/ C++)
- Prior hands-on experience or internships working in a commercial/research fission plant environment or the naval nuclear power program
Must-have Requirements:
#LI-Onsite
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.
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 $25–$32
For MS/PhD interns, the rate is $35–$38
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
More open roles at Commonwealth Fusion Systems
Hiring velocity, headcount trend, and every open posting on one page.
Similar roles
Open postings ranked by description similarity — useful if this role isn't quite right.
- Intern - Nuclear Engineer - Summer 202797% matchCommonwealth Fusion Systems· Devens, MA· $52k–$79k USD· same company
- Intern - Health Physics - Spring or Summer 202787% matchCommonwealth Fusion Systems· Devens, MA· $52k–$79k USD· same company
- Intern - Controls Engineer - Summer 202784% matchCommonwealth Fusion Systems· Milpitas, CA· $52k–$79k USD· same company
- Intern - Mechanical Equipment Engineer - Spring 202781% matchCommonwealth Fusion Systems· Devens, MA· $52k–$79k USD· same company
- Principal RF Systems Engineer79% matchCommonwealth Fusion Systems· Devens, MA· $172k–$260k USD· same company
- Staff Scientist - Plasma Material Interaction79% matchCommonwealth Fusion Systems· Devens, MA· $152k–$230k USD· same company