Senior Systems Engineer.

Hardware & Semiconductor Engineering Full-Time

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Senior Systems Engineer: our view in 3 lines...

The Role:This role is for a senior systems engineer supporting the development of complex tokamak subsystems for fusion power plants.
The Person:The person will develop requirements, define interfaces, run trade studies and risk assessments, support design reviews, and plan testing and commissioning for complex tokamak subsystems.
Requirements:The role calls for a bachelor's or master's degree in Engineering or Physics, 7+ years of experience in Systems Engineering, and experience with Verification & Validation, failure modes analysis software, and SysML based tools.

About the role

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 Senior Systems Engineer

CFS is currently looking for a Senior Systems Engineer or Systems Engineer II with a mechanical background, who will focus on implementation of Systems Engineering process and systems thinking to subsystems that form the core of the SPARC & ARC tokamaks. This role is inherently cross-disciplinary, and will require collaboration with a wide variety of stakeholders to ensure that systems are designed, integrated, and operated successfully. The Systems Engineer will be responsible for supporting a group of mechanical subsystems, working on activities throughout the development lifecycle, including requirements development, interface definition, trade studies, risk assessment and management, operational concept/control architecture development, test planning, etc. The ideal candidate for this role is comfortable with learning a variety of new technical topics and being proactive to apply that knowledge to ensure that tokamak system development and implementation is successful in validating the current SPARC mission and ARC programs.

Candidates interested in this role should have some related experience and interest in working with the following types of systems we are currently looking for support on:

Both superconducting and non-superconducting magnet systems, or similar electromechanical systems, or:
Complex mechanical systems subject to a variety of thermal, structural, and electrical requirements with multiple interfaces.

What you'll do:

Elicit, decompose, and establish traceability of system requirements in a requirements database
Support requirements driven architecture trade studies for a system
Coordinate, define, and control interfaces between systems and their interfacing systems
Conduct trade studies to drive/coordinate technical decision making. Present proposals for decision closures to the appropriate level of management
Conduct risk assessments on systems using failure modes analysis software and methods, and
ensuring that risk mitigation plans are developed and implemented
Manage changes affecting system technical baseline for impact to scope, schedule, cost, performance, or interfacing systems
Support design review content development and the review of other design reviews for technical maturity, consistency, and accuracy
Develop test plans for and document evidence against requirements verification and validation Develop requirement/risk informed testing and commissioning plans

What we’re looking for:

Bachelor's or Master's degree in Engineering, Physics, or a related field

7+ years of experience in Systems Engineering or other related engineering roles

Experience working in the development of large, integrated and complex systems, preferably fusion, energy, aerospace, defense, transportation, etc.

General knowledge of mechanical, electrical, I&C, and industrial concepts with the ability to learn and apply new technical concepts

Strong, foundational knowledge of mechanical systems

General knowledge of electrical engineering concepts

Strong interpersonal and technical communication skills, with the ability to proactively engage and communicate with a wide range of stakeholders

Experience working in an environment where creative, proactive problem solving is required with a wide range of stakeholders

Bonus points for:

Prior experience in superconducting magnet based systems development

Hands on integration and testing experience while leveraging Verification & Validation life cycle methods

General knowledge of tokamak and fusion plant engineering concepts

General knowledge in any of the following areas: high and ultra-high vacuum, materials science, electrical insulation design for high voltage applications, thermo-structural analysis techniques

Experience with multi-objective design optimization techniques, specifically applied to architectural design of complex systems

Model Based Systems Engineering experience, specifically utilizing SysML based tools

Experience with technology roadmapping and development for first of a kind systems and programs

Must-have Requirements:

Perform activities such as typing, standing, or sitting for extended periods of time

Dedication to safety to mitigate hazards that may include heat, cold, noise, fumes, strong magnets, lead, high voltage, and cryogenics

Willingness to travel or work required nights/weekends/on-call occasionally to support off site testing

#LI-Hybrid

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.

Published September 2, 2026

Location Devens, United Kingdom

Category Hardware & Semiconductor Engineering

Job Type Full-Time

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