Intern - Software Engineer - Summer 2027

About the role

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 Software Engineering Intern

We are looking for a talented Software Engineering Intern to join our team! CFS interns are highly valued within the organization and placed into meaningful and challenging roles.

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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:

Develop simulation models and model infrastructure for both real-time and off-line (high fidelity) simulations

Develop control software across multiple platforms, including real-time Linux, microcontrollers, FPGAs, or PLCs

Full-stack software development for internal data storage & analysis tools

Develop operator interfaces, workflows, and data analysis tools

What we’re looking for:

Pursuing an engineering degree with focus in the field of Computer Science

Familiar with programming languages such as C++, Python, and Golang

Experience with control or real time software

Hands-on experience through academic research, project teams, machine shops, hackathons, or industry internships

Demonstration of exceptional results through a range of different pursuits

High self-motivation and drive to execute quickly with excellent troubleshooting/problem-solving skills Strong communication skills and a willingness to learn

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

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$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

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

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#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.