Intern - Cryogenics Engineer - Spring Co-op 2026

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 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 Cryogenics Engineer Intern

The Cryogenics team is an enthusiastic group of full-time engineers with backgrounds that span from Aerospace to National Labs to Start Ups. Our goal is to develop cryogenic helium systems that are critical to keeping the HTS magnets within superconducting temperatures. We work in a fast-paced and strategically collaborative setting that allows us to take designs from concept to hardware within extremely short time spans. We are looking for an energetic co-op student to join our team. Within this co-op, you will be working on engineering design and analysis.

Program Details:

• 26 week internship
• 40-50 hours per week with set hourly salary based on year in school
• Opportunity 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:

• Lead and cross-coordinate with various stakeholders on design-build, test, and/or analysis projects, ensuring requirements and key system objectives are being met
• Develop test plans for cryogenics equipment and subsystems
• Identify, purchase, and install hardware to be used in setting up or fixing test configurations
• Run testing of industrial-scale cryogenics equipment and subsystems
• Analyze data from testing industrial-scale cryogenics equipment and subsystems
• Learning objectives would include but not be limited to:
• (1) Process engineering. Read and develop key engineering documents, e.g. process flow diagrams (PFDs), piping & instrumentation diagrams (P&IDs), test plans, test procedures
• (2) Thermohydraulics analysis. Develop calculations, tools, and models, e.g. Excel calculations and tools, 1-D thermohydraulic models (EcoSim), computational fluid dynamics (COMSOL)
• (3) Project management. Build tools to manage and report on project milestones. Manage small budgets.
• (4) Hands-on building and testing. Past examples - flow instrumentation panels, vacuum carts and headers, swagelok tubing setups, helium leak testing configurations, oil removal bakeouts, helium purity measurement and calibration

What we're looking for:

• Preferred majors include Chemical Engineering, Mechanical Engineering, Electrical/Software Engineering, and Computer Science
• Enthusiasm to learn (design and engineering company processes) and collaborate in a group setting
• Exposure to fluid dynamics and thermodynamics
• Exposure to programmable logic controllers and electrical schematics
• Exposure to CAD software
• Exposure to FEA and/or CFD software
• Interest in entrepreneurship

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

$23 - $35 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 $23-$29

For MS/PhD interns, the rate is $32-$35

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.