Senior Electrical Engineer, Power Electronics

Company Overview

Mainspring Energy is revolutionizing power generation with the world’s most flexible and adaptable local power generation technology, the Mainspring Linear Generator. Commercial, industrial, and utility leaders are choosing Mainspring over traditional options like engines, turbines, and fuel cells to quickly and reliably deliver local power for EV charging, commercial facilities, data centers, and grid‑scale operations. The Linear Generator is fuel‑flexible, ramps up and down to meet demand, and utilizes a flameless reaction with near‑zero NOx emissions.

Backed by top‑tier investors including Khosla Ventures, Bill Gates, American Electric Power, Lightrock, and General Catalyst, Mainspring designs, manufactures, and delivers its products across the U.S. and is scaling for international expansion.

Our core values guide everything we do:

• Pragmatic Optimism – balanced ambition and creativity with practical problem‑solving.
• Excellence without Ego – technical rigor combined with humility and customer focus.
• Proactive Collaboration – intentional inclusion of diverse skills, perspectives, and priorities.

We are looking for a power electronics engineer to shape the future of the Linear Generator’s power electronics systems. The role involves designing, validating, and improving hardware that underpins key functions of our generator.

• Design custom power electronics hardware that enables key functions of our Linear Generator.
• Bring‑up, validate, and qualify your power electronics designs.
• Troubleshoot complex hardware issues that arise in the test lab, production floor, and fielded units.
• Collaborate with the production introduction team and external suppliers to improve designs for manufacturability and testability.
• Partner with reliability engineers to further drive up electrical hardware reliability.
• Serve as an expert on the hardware systems that you own.

• Bachelor’s degree or higher in Electrical Engineering.
• 5 years of experience developing power electronics technologies.
• Excellent electronics design fundamentals; ability to take concept‑level details, select components, and produce a schematic.
• Examples of taking ownership of a power electronics design project.
• Circuit board design experience.
• Familiarity with schematic capture and power converter circuit modeling/simulation tools.
• Knowledge of power electronics control theory.
• Proficiency with EE tools (Oscilloscopes, Power Analyzers, Network Analyzers, Signal Generators, etc.).
• Experience with power semiconductor selection, gate drive, and protection circuit design.
• Proven ability to work independently on an electronics design project.
• Clear verbal and written communication skills.
• A passion for hands‑on hardware development.
• A “collaborate‑first” mindset and have successfully communicated across a range of teams and personalities.

• Experience designing high‑voltage (480
  
  VAC or 800
  
  VDC range) systems.
• Experience designing kW‑level power electronics.
• Experience in the full hardware development life cycle, from requirements development to manufacturing support.
• Experience working at a startup or rapid development environment.
• Experience with Altium.

Mainspring Energy, Inc. is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, protected veteran status, or disability.