Intern - Mechanical and Magnet Engineer - Spring or Summer 2027

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

Benefits offered by this job

Sick time

Health insurance

401(k) with employer matching

Professional growth opportunities

Team-building activities

Job summary

Commonwealth Fusion Systems LLC is seeking Mechanical or Magnet Engineering Interns for 13–26 week on-site roles in Devens, MA. Interns work 40–50 hours weekly with hourly pay based on year in school; on-site housing/transportation may be needed.

Projects span tooling design, magnet production, and design-for-manufacturing. Open to BS, MS, and PhD students, with emphasis on hands-on experimentation and collaboration within engineering teams.

Qualifications

• Pursuing a degree in Mechanical Engineering and active student status.
• Experience with 3D CAD, machine shop, rapid prototyping and assembly.
• Strong troubleshooting and problem-solving skills across projects.
• Excellent communication and teamwork within technical teams and with non-technical partners.
• Authorized to work in the United States for any employer.

Responsibilities

• Tooling and hardware design to accelerate magnet production and assembly.
• Perform multiphysics and structural analysis and develop optimization tools.
• Prototype and iterate next-generation designs for cost reduction and manufacturability.

Skills

3D CAD

Rapid prototyping

Hands-on teamwork

Problem-solving

Education

Enrolled in Mechanical Engineering program

Tools

Machine shop equipment

Prototyping equipment

First-principles analysis tools

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.

Join the power movement as a Mechanical or Magnet Engineering Intern

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

Program Details:

• 13-26 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:

• Tooling and Hardware Design - Accelerate magnet production and SPARC assembly via design, first principles analysis, and rapid prototyping
• Multiphysics and Structural Analysis - Develop optimization tools and perform design optimization and cost reduction for next generation magnet systems and tokamak structures
• Prototyping and Next-Gen Architecture Optimization - Fabricate and iterate on next-generation designs to inform design-for-manufacturing (DFM) and design-for-assembly (DFA) trade studies, cost reduction, and commercialization of fusion systems

What we’re looking for:

• Pursuing a degree with focus in the field of Mechanical Engineering
• Prior experience with 3D CAD, machine shop, rapid prototyping and assembly, first-principles structural and thermal analysis, active participation and hands on experience on student teams (Formula SAE, Rocket Club, etc)
• Demonstration of exceptional results through a range of different pursuits
• High self-motivation and drive to execute quickly with excellent troubleshooting/problem-solving skills
• Communication - not afraid to ask for help, shows evidence that they’d integrate nicely into a team of technical engineers / scientists, but also able to communicate with people with less of a technical background, like technicians, supply chain, etc

Must-have Requirements:

• 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

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, 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.