Mechanical Engineer - Toroidal Field Coil

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 Mechanical Engineer – Toroidal Field Coil

Commonwealth Fusion Systems (CFS) collaborates with MIT to leverage groundbreaking high-temperature superconducting (HTS) magnet technology to build compact fusion power plants. As a Mechanical Engineer on the SPARC Toroidal Field (TF) Coil System Winding Pack team, you will act as a "Core Player"—a reliable and versatile contributor executing on mid-to-long-term assignments that are critical to the project's success. You’ll also work closely with peers across the organization— from other HTS magnet systems, R&D, Physics, Quality, Production, Assembly, Program Management—to ensure success of the SPARC mission.

In this role, you will own technical execution of a key Winding Pack subassembly as it transitions from final design to physical reality. You will serve as the technical anchor on the manufacturing floor, using deep mechanical engineering fundamentals to resolve complex non-conformances and validate "as-built" conditions. This position offers a unique vista: by mastering the practical challenges of building and testing the SPARC TF coils today, you will build the deep, hands‑on intuition required to design the high-field, superconducting magnet systems of the future.

We are looking for a self‑starter who values continuous learning and is eager to bridge the gap between rigorous analysis and rapid execution.

• Use first principles physics as a basis for all decisions
• Act as the primary technical resource for "shipside" support, collaborating closely with quality and manufacturing to solve emerging challenges during production, assembly, and installation
• Perform structural and thermal calculations, ranging in complexity from first-principle hand calculations to FEA
• Solve integrated engineering challenges across multiple disciplines to proactively mitigate engineering and operational risks
• Generate detailed work plans and define milestones for the transition from component manufacturing to SPARC assembly
• Anticipate operational trends and challenges, contributing to future‑oriented planning for SPARC commissioning

• Bachelor’s degree in mechanical engineering, aerospace engineering, physics, robotics, or another relevant field
• Candidates with degrees in Electrical Engineering who have strong mechanical or structural engineering competency should feel encouraged to apply
• 3+ years' experience in design‑build fundamentals: CAD (NX Preferred), component selection, structural analysis, design for manufacturing, GD&T
• Experience working in an extremely fast‑paced environment
• Experience taking a part from concept through production, with a proven ability to resolve technical hurdles in a manufacturing setting
• Demonstrated ability to perform structural analysis via hand calculations and FEA (ANSYS Workbench preferred)
• Familiarity with interpreting GD&T and inspection reports
• A deep understanding of mechanical and structural engineering fundamentals
• Familiarity with electromagnetic fundamentals – voltage, current, resistance, Ohm’s Law, AC/DC, right‑hand rule, solenoids, etc
• Ability to innovate creative solutions to challenging problems
• A can‑do attitude and an eagerness to learn
• Ability to operate with general guidance and take independent ownership of execution approaches
• High self‑motivation and drive to execute quickly
• Effective at communicating technical topics to both technical…