Intern Scientific Software Engineer Summer 2027

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 were working with policymakers suppliers and many others to build the energy industry of the future.

Were in the best position to make it happen. Since 2018 weve raised $4 billion of capital making us the largest and leading 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 a Scientific Software Engineering Intern

We are looking for a talented Scientific Software 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 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:

• Port high-performance electromagnetics kernels to the GPU. Youll start with the Biot-Savart magnetic-field calculation in cfsem CFSs open-source Rust library and extend it to include cross-platform GPU kernel variants with Python bindings
• Hold your code to a scientific-correctness bar. Youll check the GPU kernels against cfsems existing unit tests and CPU versions and determine if your methods are accurate enough for engineers who rely on the results to design superconducting magnets
• Measure and report GPU performance. Youll benchmark speed and accuracy against the optimized multithreaded Rust CPU kernels and present a clear recommendation on where GPU acceleration pays off and where it doesnt
• Ship public open-source work. Youll put the new kernels behind cfsems existing Python interface so they reach CFS engineers working on SPARC and future fusion magnets and youll leave with merged contributions to a public Rust/Python project

What were looking for:

• Pursuing an engineering degree with focus in the field of Computer Science
• Contributed to a multi-person software project
• Rust programming language
• Software performance engineering (class project or internship experience)
• Demonstration of exceptional results through a range of different pursuits
• High self-motivation and drive to execute quickly with excellent troubleshooting/problem-solving skills

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

F or 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

#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