Intern - Mechanical Engineer - Fall Co-op 2026

Commonwealth Fusion Systems•Devens, MA

16d•$23 - $35•Onsite

About The Position

Commonwealth Fusion Systems is on a mission to deliver the urgent transition to fusion energy. Combining decades of research, top talent, and new technologies, weâre designing and building commercially viable fusion power plants. And working with policymakers and suppliers to build the energy industry of the future. Weâre in the best position to make it happen. Since 2018, weâve raised nearly $3 billion in capital, making us the largest and leading private fusion company in the world. Now weâre looking for more thinkers, doers, builders, and makers to join us. People whoâll bring new perspectives, solve tough problems, and thrive as part of a team. If thatâs 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: 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 teamâs existing need. Opportunities available for currently enrolled college students in all levels of schooling from bachelorâs degree to PhD Interns must be authorized to work in the United States for any employer What you'll do: Design custom tooling, fixturing, and multi-part assemblies Work with design and equipment engineers to develop custom automation equipment Hold design reviews with fellow engineers to ensure proper design fundamentals CAD design work, creative problem solving, report writing, data collection, and hands on assembly of test pieces Develop and qualify manufacturing techniques, processes, flow maps, and work instructions for superconducting magnet components and assemblies Develop assembly methods and tools to perform specific tasks within the larger goal of SPARC assembly Spend time on the floor and work with technicians to make manufacturing processes better

Requirements

Pursuing an engineering degree with focus in the fields of Mechanical, Electrical or Aerospace
CAD design experience
Familiarity with hand tools (machine shop experience is a plus)
Experience in a manufacturing environment.
Hands-on experience through academic research, project teams, machine shops, hackathons, or industry internships
Demonstration of exceptional results through a range of different pursuits
High self-motivation and drive to execute quickly with excellent troubleshooting/problem-solving 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

Nice To Haves

FEA is a plus
machine shop experience is a plus

Responsibilities

Design custom tooling, fixturing, and multi-part assemblies
Work with design and equipment engineers to develop custom automation equipment
Hold design reviews with fellow engineers to ensure proper design fundamentals
CAD design work, creative problem solving, report writing, data collection, and hands on assembly of test pieces
Develop and qualify manufacturing techniques, processes, flow maps, and work instructions for superconducting magnet components and assemblies
Develop assembly methods and tools to perform specific tasks within the larger goal of SPARC assembly
Spend time on the floor and work with technicians to make manufacturing processes better