Intern - Mechanical Engineer - Fall Co-op 2026

United States·DevensInternshipentry

EngineeringMechanical Engineer

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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,

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EngineeringMechanical Engineer

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 and suppliers to build the energy industry of the future.

We’re in the best position to make it happen. Since 2018, we’ve raised nearly $3 billion in capital, making us the largest and leading private 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 Mechanical Engineering Intern

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

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

Design and build of tooling used for integration and assembly of complex hardware

Development of workflows to reverse engineer hardware or adjust installation to meet final system tolerances

Supporting in-field integration of hardware into a tokamak fusion device

Design of actuated systems to remotely install and remove large structural components

Pursuing an engineering degree with focus in the fields of Mechanical, Electrical or Aerospace

Curious, high-initiative, and bias towards execution

Approaches problems from a fundamental physics perspective

Crisp communication paired with technically dense documentation

Ideally, background in design, build, and test of highly-loaded hardware or large tooling assemblies

Ideally, experience with CAD systems to design parts and release drawings for manufacturing

Understanding of GD&T

Ideally design review experience in a technical environment

Ideally experience running simple testing to validate designs

A commitment to a safe working environment

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