Project Engineer, Electrical Engineering

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.

More information can be found at

Project Engineers report to the Project Engineering Manager within the Project Delivery department. A key enabler of Mainspring’s mission is the ability of its team to deliver solutions based on our linear generator technology that solve customer problems in the cross-section of resiliency and clean power supply.

The project engineering team provides the technical expertise, guidance, and support to deploy linear generators into the field efficiently—building customer confidence and enabling future scalability.

• Leading the overall technical definition and direction of assigned projects that includes site layouts, equipment selection, sequences of operation, controls and communication schemes, electrical protection schemes, code compliance, utility interconnection requirements, fuel systems, safety systems, etc. to ensure project success
• Guiding selection of electrical and mechanical equipment such as panel boards, networking hardware, breakers, transformers, ground-fault protection, electric meters, gas regulators, valves, etc. best suited for the application; supporting procurement activities as needed
• Working directly with clients & engineering partners to interpret needs and ensure correct translation of project requirements to official plan sets, use of best practices, QA/QC standards & policies, and presence of due diligence through the project lifecycle
• Answering RFIs, approving submittals, and reviewing project documents and designs to identify/close gaps in function, performance, scope, and responsibility to ensure project success during the permitting, design development, construction, commissioning, and testing phases
• Conducting engineering reviews, site assessments, inspections, load study analyses, report creation, and other technical tasks inherent in the assessment, development, and implementation of onsite energy projects
• Providing the…