Intern - Mechanical Engineer - Summer 2027
cfsenergy· Internships
About this 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 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.
Program Details:
- 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
What you'll do:
- 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
What we’re looking for:
- 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
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
#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.
Frequently Asked Questions
What is the salary for the Intern - Mechanical Engineer - Summer 2027 role at cfsenergy?
The listed salary for this Intern - Mechanical Engineer - Summer 2027 position at cfsenergy is USD 25–38. This is an Internship role.
Where is the Intern - Mechanical Engineer - Summer 2027 position at cfsenergy located?
This Intern - Mechanical Engineer - Summer 2027 role at cfsenergy is based in Milpitas, CA. The position is listed as on-site or hybrid. Check the full job description or apply directly to confirm the work arrangement.
Is the Intern - Mechanical Engineer - Summer 2027 role at cfsenergy full-time or part-time?
This is listed as a Internship position. It is posted as a Intern - Mechanical Engineer - Summer 2027 role in the Internships department at cfsenergy.
Which team or department does the Intern - Mechanical Engineer - Summer 2027 at cfsenergy belong to?
This Intern - Mechanical Engineer - Summer 2027 position is part of the Internships department at cfsenergy. See the full job description for more information about the team structure and responsibilities.
How do I apply for the Intern - Mechanical Engineer - Summer 2027 position at cfsenergy?
Click the "Apply Now" button on this page. You will be redirected to cfsenergy's official application portal hosted on lever where you can submit your application directly.
When was the Intern - Mechanical Engineer - Summer 2027 job at cfsenergy posted?
This Intern - Mechanical Engineer - Summer 2027 position at cfsenergy was posted on Oct 15, 2026. Apply as soon as possible — early applications are often reviewed first.
Intern - Mechanical Engineer - Summer 2027
cfsenergy · 💰 USD 25–38
You'll be redirected to cfsenergy's official application page on Lever.