Senior Power Electronics Engineer

Commonwealth Fusion Systems

Harvard (MA)

On-site

USD 100,000 - 135,000

Full time

14 days+

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Benefits offered by this job

Competitive compensation with equity

Flexible vacation days

Health, dental, and vision insurance

401(k) with employer matching

Job summary

Commonwealth Fusion Systems in Massachusetts seeks a Senior Power Electronics Engineer to design and validate power electronic systems for fusion energy applications. The role involves leading projects, collaborating with teams, and ensuring high-quality design and compliance with specifications.

Candidates should have extensive experience in power electronics, effective communication skills, and a track record of working with high-power systems. This position comes with competitive compensation, equity, and comprehensive benefits.

Qualifications

8+ years of experience with power electronics systems.
Proven track record in design and development of electrical systems.
Experience with high power electrical equipment (>10MW) is a plus.

Responsibilities

Design and validate power electronic circuits for medium voltage systems.
Lead electrical design projects, ensuring quality and compliance.
Collaborate with teams on procurement contracts and coordination.

Skills

Power electronics design

Modeling & simulation

Communication skills

Troubleshooting

Project management

Education

Bachelor’s or Master’s degree in relevant field

Tools

PLECS

PSPICE

MATLAB

Oscilloscopes

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. If that’s you and this role fits, we want to hear from you.

Join the power movement as a Senior Power Electronics Engineer

Senior Power Electronics Engineer reporting to the Director of Power Systems in the SPARC team at CFS. Responsible to lead and coordinate electrical design projects and interface with cross‑function stakeholders while ensuring a high‑quality design release that meets specifications, project timelines within budget allocated.

What you'll do

Design, model, simulate, analyze and validate power electronics circuits, magnetic components and control strategies for medium voltage power electronic converter systems (i.e. power supplies)
Define components and develop technical requirements and specifications for power electronic converter systems and other electrical designs
Develop test methods to qualify design from concept through final testing and commissioning steps including troubleshooting of converter systems
Contribute to cross‑functional technical design activities to build and deliver electrical system designs for fusion power
Collaborate with cross‑functional teams on critical procurement contracts & vendor coordination efforts of critical technical and other project milestones
Define requirements and lead initial commissioning activities for power electronic systems
Document design specifications, simulations and test results into engineering reports

What we’re looking for

8+ years of related experience with Bachelor’s degree (or) a Master’s degree with 6+ years of experience with power electronics based systems
Proven track record in design and development (system, protection, control & mechanical integration) of power electronics based electrical systems
Knowledge of various inverter circuit topologies and the benefits and limitations
Experience with modeling & simulation with analysis tools such as PLECS, PSPICE, MATLAB etc.
Experience with semiconductor devices (IGBT, MOSFET, etc.) and magnetic components (transformers, inductors etc.)
Fundamental understanding of gate drive circuits, design and device protection
Experience with packaging design of power conversion equipment and thermal management
Experience with high power electrical equipment >10MW
Experience with hands on testing of electrical components, sub‑assemblies and systems in the laboratory and use of oscilloscopes and other measurement equipment
Excellent written and verbal communication skills, ability to conduct design reviews, organize / present results to both expert and non-technical audiences
Results driven and ability to embrace and convince stakeholders on a change in design direction in pursuit of a high‑quality product release

Bonus points for

Master’s degree in electrical engineering with a focus on Power Electronics
Experience in practical application of electrical engineering skills to construction, manufacturing, testing and field installations
Experience with application of compliance standards to the designs (IEC, UL, CSA, NEC etc.)
Experience in problem solving, root cause analysis and field containment actions
Experience with hands on prototype build, prototype testing and documentation of results is a plus
Experience with scaling up independent systems to a larger system to meet higher power requirements

Must-have Requirements

Ability to lift up to 50lbs
Perform activities such as standing, typing or sitting for extended periods of time
Willingness to travel or work required nights/weekends/on‑call occasionally
Work in a facility that contains industrial hazards including heat, cold, noise, fumes, strong magnets, lead (Pb), high voltage, high current, pressure systems, and cryogenics

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.

Salary range for this full‑time position + equity + benefits. The actual salary will depend on level, location, qualifications, and experience. The range displayed on each job posting reflects new hire salaries for the position across all U.S. locations.

Benefits include