Intern R&D Test Engineer Summer 2026

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 were designing and building commercially viable fusion power plants. And working with policymakers and suppliers to build the energy industry of the future.

Were in the best position to make it happen. Since 2018 weve raised nearly $3 billion in capital making us the largest and leading private fusion company in the world.

Now were looking for more thinkers doers builders and makers to join us. People wholl bring new perspectives solve tough problems and thrive as part of a team.

If thats you and this role fits we want to hear from you.

Join the power movement as an R&D Test Engineering Intern

The R&D Intern will work with the TF R&D team primarily at CFS-1 to de-risk SPARC TF magnet components. Responsibilities include supporting engineers in designing and building test stand components / fixtures for testing as well as conducting tests and analysis to obtain high quality data that informs actionable recommendations on an aggressive schedule supporting magnet technology development.

Program Details :

• 12-16 week internship program
• 40-50 hours per week with set hourly salary based on year in school
• Opportunities vary between onsite in Somerville MA and 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 teams existing need.
• Opportunities available for currently enrolled college students in all levels of schooling from bachelors degree to PhD
• Interns must be authorized to work in the United States for any employer

What youll do :

What were looking for :

Must-have Requirements :

$23 - $35 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 $23$29

F or MS / PhD interns the rate is $32$35

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

#LI-Onsite

At CFS we excel in fast-paced environments driven by our values of integrity execution impact and self-critique. As we grow were 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.

Required Experience :

Intern

Key Skills

Laboratory Experience,Vendor Management,Design Controls,C / C++,FDA Regulations,Intellectual Property Law,ISO 13485,Research Experience,SolidWorks,Research & Development,Internet Of Things,Product Development

Employment Type : Intern

Experience : years

Vacancy : 1

Monthly Salary Salary : 32 - 35