SECTION I · THE BRIEF
Brief #01914Updated 15 OCT 2026DEVENS, MALeverKHOSLA VENTURES
Employbl Company Profile

Intern - Nuclear Engineer - Summer 2027

Commonwealth Fusion Systems (CFS) is an American company founded in 2018 aiming to build a compact nuclear fusion power plant based on the ARC tokamak reactor concept. The company is based in Cambridge, Massachusetts,…

Location
Devens, MA
Company size
500–2,000
Posted
Today
Via
Lever
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Intern - Nuclear Engineer - Summer 2027

Commonwealth Fusion Systems· Devens, MAView company profile


Job title
Intern - Nuclear Engineer - Summer 2027
Job location
Devens, MA
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 Engineering Intern
We are looking for a talented Nuclear Engineering Intern to join our team! CFS interns are highly valued within the organization and placed into meaningful and challenging roles.
Program Details:
  • 13-18 week internship
  • 40-50 hours per week with set hourly salary based on year in school
  • Opportunities on site 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:
  • The intern will work on projects such as, but not be limited to: Neutronics analyses such as energy deposition in delicate materials or shielding sensitivity studies for diagnostic design
  • They will collaborate with engineers on the Nuclear Engineering team to do neutronics calculations (heating, activation, flux, dose, etc) to support the design and operation of SPARC, the scoping of ARC, and any other nuclear engineering needed
  • They will have opportunities to contribute to the computational development of method and workflows needed to support and optimize different types of neutronics analyses
  • What we’re looking for:
    • Pursuing an engineering degree with focus in the field of Nuclear Engineering - required
    • Have complete by the start of their internship Neutron Transport or Neutronics or a Reactor Theory course
    • Experienced in MCNP or OpenMC
    • 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++, Neutronics Methods (Monte Carlo or Deterministic)
    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
  • View job listing ↗
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    Commonwealth Fusion Systems headquarters

    Cambridge, MA

    Company size

    500–2,000 employees

    Founded

    2018

    Total raised

    $3,877,000,000

    View company profile ↗

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    Funding rounds