Senior Manufacturing Engineer

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 $816 B 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. More information can be found at .

We are seeking an innovative and highly skilled Manufacturing Engineer to lead the design, development, and implementation of assembly tooling, material handling systems, and scalable production processes for a groundbreaking large electromechanical machine.

In this role, you will play a critical role in translating product designs into manufacturable, high‑precision, and robust components and assemblies  will work closely with Mechanical Design engineers to drive DFM/DFX initiatives, process error‑proofing, and tooling robustness, ensuring efficiency, repeatability, and quality across our production lines.

The ideal candidate will have a strong background in precision fixture design, material handling solutions, overhead lift assist systems, and MES systems. Experience in precision measurement and laser‑based assembly processes is a significant advantage. Additionally, this role requires end‑to‑end ownership, including sourcing, assembly, commissioning, and installation of designed systems.

Join our team if you are ready to bring your expertise to the forefront of manufacturing technology, contributing to the success of our linear generator startup.

• Lead the design of high‑precision fixtures, tools, and equipment for electromechanical assembly and testing
• Develop material handling solutions, overhead lift assist systems, and custom conveyors, joining technologies and torque/angle control nutrunners
• Implement precision measuring systems and laser alignment processes for high‑tolerance assembly
• Ensure all tooling and equipment meet rigorous quality and performance standards
• Manage end‑to‑end project execution, from concept through installation and commissioning
• Collaborate with cross‑functional teams, including R&D, operations, and procurement, to align manufacturing solutions with product requirements
• Layout planning for future factory design initiatives and collect and document product and process requirements to feed equipment and tooling design and also define the process readiness for automation introduction
• Oversee the manufacturing and assembly of designed tooling and equipment, ensuring timelines and quality standards are met
• Contribute to new product development and collaborate with design engineers, offering expertise in manufacturability (DFM/DFX) and cost effectiveness of new mechanical component designs
• Utilize DOE, PFMEA, 8D and other industry‑standard tools and techniques to actively identify and address risks and optimize process parameters
• Assess the sustainability of a fabrication technology for a given part design, plan validation experiments to demonstrate initial feasibility as well as manufacturing capabilities, analyze the results and provide technical recommendations

• Bachelor’s or Master’s degree in Mechanical Engineering, Manufacturing Engineering, or a related field
• 5+ years of experience in…