Intern - Nuclear Engineer - Summer 2027

Commonwealth-Fusion-Systems-5; Harvard (MA); On-site; USD 34,000 - 52,000; Full time

Benefits offered by this job

Sick time

Health, dental, vision insurance

401(k) with employer match

Professional growth opportunities

Team-building activities

Job summary

Commonwealth Fusion Systems is seeking a Nuclear Engineering Intern to contribute to neutronics analyses and engineering projects in Devens, MA. You will work with the Nuclear Engineering team, performing calculations and assisting in the design and operation of fusion-related systems.

Ideal candidates are pursuing an engineering degree in Nuclear Engineering, with coursework in Neutron Transport or reactor theory, and experience with MCNP/OpenMC.

Qualifications

• Pursuing an engineering degree with focus in Nuclear Engineering.
• Must have completed by start of internship Neutron Transport/Neutronics or a Reactor Theory course.
• Experience with MCNP or OpenMC is preferred.
• Strong communication and teamwork; self-motivated and quick to troubleshoot.
• Cad and/or Python/C++ knowledge is a plus.

Responsibilities

• Contribute to neutronics analyses (energy deposition, shielding, diagnostics).
• Collaborate with Nuclear Engineering team on calculations (heating, activation, flux, dose).
• Help develop workflows for neutronics analyses and method improvements.

Skills

Nuclear Engineering

Neutron Transport

MCNP

OpenMC

Python

C++

Education

Nuclear Engineering

Tools

MCNP

OpenMC

CAD

Python

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

$25 - $38 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 $25–$32

For MS/PhD interns, the rate is $35–$38

• 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

#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.