Electrical Engineer - Power Electronics

Department: R&D

Location: San Francisco

Compensation: $115K – $170K • Offers Equity • $5,000 Relocation Reimbursement

Employment Type: FullTime

About Marathon Fusion

Marathon Fusion is building the engineering technologies needed to scale fusion from breakeven experiments into real power plants. While much of the industry is focused on proving new fusion devices, our focus is on the practical systems that will make fusion deployable at climate-relevant scale.

We develop core fuel cycle and plant-level technologies for stable isotope production, fuel cycle closure, and advanced blanket systems that enable both energy generation and high-value co-products.

Founded in 2023, Marathon Fusion is building the components and systems that will help fusion become a practical, abundant, and reliable energy source for the 21st century.

Culture at Marathon Fusion

We are a startup environment characterized by a need for focus, adaptability and prioritization in a shifting landscape. Thriving in this environment requires excellent proactive communication across roles and backgrounds, the ability to build and maintain trust between team members, and the willingness to learn and develop new skills on the job. We place particularly high weight on each team member's ability to be self-directed.

About the Role

As an Electrical Engineer at Marathon Fusion, you'll work closely with our R&D team of mechanical engineers, physicists, and technicians to prototype, test, and deploy solutions in the pursuit of advancing fusion fuel cycles. From PBC design to testing high-voltage, high-current systems, you'll play a pivotal role in developing robust power electronics for our Plasma Centrifuge and Transmutation R&D efforts.

What You’ll Do

• Design and develop power electronics subsystems, including capacitor banks, battery systems, power conversion, and switching.

• Design, prototype, and test PCBs for experimental systems.

• Integrate power electronics into high-voltage and high-current systems at the platform level.

• Work closely with mechanical engineers, controls engineers, physicists, and technicians to build and integrate electrical systems into experimental platforms.

• Test, validate, and troubleshoot hardware in lab environments.

• Drive safe design practices for high-energy systems.

What You'll Bring

We are open to candidates across a range of experience levels. Strong candidates will have experience in the following areas:

• Experience with power electronics design

• Experience with PCB design and layout tools

• Strong fundamentals in circuits, electromagnetics, and system design

• Hands-on experience building and testing hardware

• Strong debugging and problem-solving skills

Preferred Experience, But Not Required

• Experience leading or mentoring in electrical engineering settings

• Familiarity with compact high-voltage and/or high-power systems -- large-scale capacitors, DC-DC converters, battery energy storage systems, power transmission and high power DC power supplies

• Familiarity with LabVIEW, Python, or similar tools for interacting with control and data acquisition systems

Compensation and Benefits

Our compensation for this role is purposefully wide to encompass a variety of levels we're willing to hire. Your final compensation package will be determined by an evaluation of your experience and qualifications. All full-time employees receive equity as part of their compensation.

We're proud to offer the following benefits:

• Medical, dental, and vision insurance

• Generous paid time off and sick leave

• 401(k) plan with 4% employer match

• Commuter benefits

• Fully stocked kitchen

This role is open to applicants who require relocation to the Bay Area and is supported with a $5,000 relocation reimbursement.

Marathon Fusion considers all qualified applicants equally for employment. We do not discriminate on the basis 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, ordinance, or regulation.