Manufacturing Engineer, Product Qualification

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.

More information can be found at

Mainspring Energy is looking for an energetic individual contributor, passionate hands‑on manufacturing engineer who enjoys implementing test equipment and testing processes in an industrial environment.

You will join the product qualification team and your work will have a significant influence on our start‑up company’s growth. You will directly contribute to transitioning our Linear Generator breakthrough technology to volume manufacturing and reaching a global scale.

As a manufacturing engineer on the product qualification team you will support existing manufacturing test processes at the local pilot manufacturing line as well as at a larger scale contract manufacturer. These sustaining engineering efforts will play a crucial role in preparing the company to scale production.

You will also develop new manufacturing test processes and tooling to accommodate our evolving product. From establishing functional requirements all the way to commissioning, you will work with talented engineers from various teams including: software and controls, mechanical/electrical/test engineering, quality, manufacturing and operations. You will also frequently collaborate with technicians, manufacturing partners, external equipment suppliers and contractors.

This is an exciting opportunity for a manufacturing or process engineer with experience and interest in deploying manufacturing test systems. The role is based at Mainspring Headquarters in Menlo Park, California and is primarily on‑site with limited travel within North America (less than 10%).

• Develop and capture process & equipment requirements, Process Failure Mode and Effect Analysis (PFMEA)
• Analyze production data to assess process capability of various in‑process and end of line (EOL) test operations
• Component selection, bill of material (BOM) generation and procurement process management
• Creation of mechanical Integration 3D CAD…