Senior Electrical Engineer, Inverter Systems Engineer

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 Mainspring 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 to customers across the U.S. today, and we’re quickly scaling for international expansion.

Inspired by our vision of the affordable, reliable, net‑zero carbon grid, Mainspring is rapidly expanding within the $816B global electricity equipment market, and we’re hiring the best talent to meet growing customer demand around the globe. We welcome a broad range of backgrounds, experiences, and talents to bring fresh perspectives and ongoing innovation to our customers.

We are looking to build relationships with people who share our values:

• Pragmatic Optimism. Building a new category of world‑class power generation requires the optimism of ambition and creativity, balanced with practicality to solve problems efficiently. The challenges that arise are opportunities for growth.
• Excellence without Ego. We bring expertise and commitment to creating the best customer experience, from sales to deployment and service, just as we apply deep technical rigor to building and delivering world‑class products. We strive for excellence and behave as leaders with the humility to acknowledge our challenges, both collectively and as individual contributors.
• Proactive Collaboration. The integration and cross‑disciplinary nature of Mainspring’s business requires intentionally seeking out others who bring different skills, perspectives, and priorities. Our culture of inclusion and respect extends beyond our team to interactions with our partners and customers.

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The technology that powers Mainspring’s Linear Generator is unlike any other generator technology on the market. The Linear Generator relies on innovative electrical power and control hardware systems to achieve its best‑in‑class efficiency while meeting the world’s strictest emissions requirements. These electrical hardware systems are designed by a talented team of electrical engineers that own hardware design from initial concept through test and manufacturing.

We have a highly impactful opportunity for an electrical engineer to be part of the team that is responsible for the Linear Generator’s power delivery and integration into customers’ power systems. You will own the selection, integration, configuration, and performance of commercial off‑the‑shelf inverters used in Mainspring’s Linear Generator System.

• Own inverter integration into Mainspring’s Linear Generator System, including electrical interfaces, control interfaces, configuration, and cooling constraints
• Lead the troubleshooting and root cause analysis of complex hardware issues arising in the field, lab, or during testing of grid forming and grid following inverters and AC power systems
• Configure and tune inverter parameters for stable operation across grid‑forming and grid‑following modes
• Design and execute lab and system‑level test plans to validate inverter performance, protection behavior, and system stability
• Analyze AC power waveforms, power quality, and fault behavior to diagnose system issues
• Perform critical design reviews and collaborate cross‑functionally with mechanical, thermal, controls, test engineering and software engineers to ensure holistic system performance and manufacturability

• Bachelor's or Master’s degree in Electrical Engineering or a related field
• 5+ years of hands‑on experience working with power inverters or power conversion systems
• Strong…