Supplier Quality Engineer - Special Processes

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 an 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 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.

More information can be found at

Mainspring Energy is scaling production of a first‑of‑its‑kind linear generator, a fundamentally new approach to power generation with the potential to replace combustion turbines globally. As we transition from development into volume manufacturing, supplier quality is a critical lever. This role owns the quality gate for a portfolio of suppliers producing complex components and special process parts from NPI qualification through steady‑state production.

You will operate with significant autonomy, serve as the subject matter expert on special processes for the broader SQE team, and work cross‑functionally with Design Engineering, Materials & Process, and Supply Chain to build quality into the supply chain from the start, not through inspection. This is a senior individual contributor role with real accountability and real scope.

• Build and maintain trust‑based relationships with assigned suppliers, serving as the primary quality point of contact and representing Mainspring’s quality expectations clearly and consistently across cultures and geographies, including APAC and international suppliers as we scale.

• Own the supplier quality gate from New Product Introduction (NPI) through steady‑state production, including control plan development, PPAP review and approval, and process capability studies (Cp/Cpk) for assigned suppliers.

• Issue and drive closure of Supplier Corrective Action Requests (SCARs) using structured root cause analysis methodology (8D), holding suppliers accountable to corrective action timelines and validating effectiveness.

• Review and approve material and process deviation requests from suppliers, coordinating with Materials & Process Engineering and Design Engineering as required.

• Conduct supplier process audits and site visits to assess compliance to control plans, quality system requirements, and Mainspring standards.

• Own incoming…