Intern - Materials Test Engineer - Fall Co-op 2026

Commonwealth Fusion Systems; Harvard (MA); On-site; USD 27,552 - 41,328; Part time

Job summary

Commonwealth Fusion Systems, located in Harvard, Massachusetts, is looking for a motivated Materials Test Engineering Intern. This role supports the development and testing of advanced materials critical to key tokamak systems, such as plasma-facing components and high‑field magnets.

Joining us offers a unique opportunity to work at the forefront of sustainable energy innovation within a collaborative and dynamic R&D environment.

Responsibilities

• Support the development and testing of advanced materials for plasma-facing components, the vacuum vessel, and high‑field magnets.

Job description

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 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.

Join the power movement as a Materials Test Engineering Intern

The CFS Materials Team is seeking a motivated Materials Test Engineering Intern to join our cutting‑edge team. In this role, you will support the development and testing of advanced materials critical to key tokamak systems such as plasma-facing components, the vacuum vessel, and high‑field magnets. This is a unique opportunity to work at the forefront of sustainable energy innovation in a collaborative, fast-paced R&D environment.

Responsibilities

• Support the development and testing of advanced materials for plasma-facing components, the vacuum vessel, and high‑field magnets.