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 Power Electronics Engineer Join the Pulsed Electrical Distribution System (PEDS) team at CFS as we begin development on the next-generation power supplies that will power ARC, the first grid- scale commercial fusion power plant. In 2027 our power supplies will supply SPARC with over 1GW of pulsed power. Develop a fusion engineering skillset and learn from SPARC as we demonstrate Q>1. Apply your power electronic experience to develop and qualify next-generation inverters and power supplies for ARC and beyond. We need a results driven power electronic engineer to lead our inverter development.
What you'll do:- Lead the testing, qualification and commissioning of SPARC power supplies operating up to 2kV and 50kA
- Collaborate with power semiconductor device manufacturers to develop and qualify new Si and SiC devices for the next generation of high power (>10MVA) medium voltage power supplies for ARC tokamaks
- Design and develop high-power 4Q H-bridge inverter topologies using SiC MOSFETs, IGBTs, or other high-power semiconductor devices for use within ARC tokamak power supplies
- Lead the build, test, and validation of prototype 4Q power modules including the evaluation performance/losses and validate inverter protection mechanisms, fault detection, fault response time, and safe shutdown behavior
- Model and simulate power electronic circuits and components to evaluate and characterize converter performance, efficiency, stability, etc
- Coordinate with mechanical, PCB, firmware, and manufacturing engineering teams to develop control circuits and packaged sub modules
- Develop technical requirements, specifications and qualification plans for corresponding power circuit components (capacitors, magnetics, passives, etc.) and vendor selection
- Support cross-functional team technical developments such as power distribution, energy storage, RF and other systems delivering electrical power for fusion applications
What we're looking for:- 5+ years of related experience with Bachelor's degree (or) a Master's degree with 3+ years of experience with power electronics based systems
- Hands on product development experience for power electronic converter systems
- Extensive knowledge of semiconductor devices (IGBT, MOSFET, etc.)
- Experience with high power semiconductor devices (>1kA)
- Experience with modeling & simulation with analysis tools such as PLECS, PSPICE, MATLAB etc.
- Experience with packaging design of power conversion equipment and thermal management
- Hands on testing experience in a laboratory and use of oscilloscopes and other measurement equipment
- Excellent written and verbal communication skills, ability to conduct design reviews, organize and 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 with DC power systems
- Familiarity with cascaded or interleaved systems utilizing smaller submodules to create a higher power output
- Energy storage experience
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
$107,000 - $160,000 a year
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 US locations.
Benefits include:
Competitive compensation with equity
13 Company-wide Holidays
Flexible vacation days
10 sick days
Generous parental leave policy
Health, dental, and vision insurance
401(k) with employer matching
Professional growth opportunities
Team-building activities
#LI-Onsite
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. 
