13h ago
New
USD 25–38 per hour

Intern - Mechanical Engineer - Summer 2027

United StatesUnited States·MilpitasInternshipentry
EngineeringMechanical Engineer
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Quick Summary

Overview

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,

Technical Tools
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, 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.
  • 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
  • #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.

    Location & Eligibility

    Where is the job
    Milpitas, United States
    On-site at the office
    Who can apply
    US

    About this job

    Pay per year
    ≈ $52,000–$79,040 a year
    53% below the $140,000 median for Mechanical Engineer jobs on Jobera (658 salaries).
    Who can apply
    United States
    Posted
    Today
    Employer
    has 133 open jobs on Jobera.

    Listing Details

    Posted
    October 15, 2026
    First seen
    October 15, 2026
    Last seen
    October 15, 2026

    Posting Health

    Days active
    0
    Repost count
    0
    Trust Level
    79%
    Scored at
    October 16, 2026

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    Intern - Mechanical Engineer - Summer 2027USD 25–38 per hour