Electrical Engineer, Power Systems Integration

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.

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

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• 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 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.

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. You will join a talented team responsible for our electrical system architecture. Your primary focus will be the integration and performance of high‑power conversion hardware as it interfaces with both the Linear Generator and the customer’s grid.

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. This role focuses on system‑level architecture and validation rather than ground‑up power converter or PCB design. This is a deeply hands‑on position; you will be the technical authority in the lab, personally putting grid‑interactive inverters through rigorous characterization and stability testing to ensure they meet our high standards before they ever reach a customer site.

Your ownership extends through the entire product lifecycle from fine‑tuning firmware parameters in a controlled environment to monitoring fleet performance and leading root‑cause analysis for complex system‑integration challenges in the field.

• Lead the selection, sizing, and configuration of industrial grid‑interactive off‑the‑shelf (OTS) inverters.
• 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 system‑level tests to validate grid‑edge behaviors, including low‑voltage ride‑through (LVRT) and frequency response.
• Analyze AC power waveforms, power quality, and fault behavior to diagnose system…