Intern - Mechanical 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, 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 Nuclear/Systems Engineering Intern

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

13-18 week internship 40-50 hours per week with set hourly salary based on year in school Opportunities on site in Milpitas, CA. 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

Mechanical Design & Engineering Analysis: Perform design CAD modeling, detail drafting, and fundamental engineering calculations to validate mechanical hardware Build, Assembly & Testing: Hands-on fabrication, prototyping, hardware assembly, and physical testing/validation in the shop or lab CAD & Digital File Organization: Organize CAD models, maintain standard component libraries, and clean up workspace file structures to ensure data is easy to navigate and reuse Lab & Shop Housekeeping: Assist in setting up shop toolboxes, organizing incoming parts/inventory, and implementing physical organizational systems to maintain an efficient engineering workspace

Pursuing an engineering degree with focus in the fields of Mechanical Engineering, Aerospace Engineering, Mechatronics 3D CAD modeling, engineering calculations FEA (nice to have) Hands-on assembly Basic machining 3D printing Student team and activities (Formula SAE, robotics, machine shop expreience) Strong organizational skills

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