Senior NPI Manufacturing Engineer

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

Job Overview

Mainspring Energy seeks a Manufacturing Engineer to join our New Product Introduction (NPI) team. This role involves learning about our novel linear motor design and participating in the development of new manufacturing techniques, tooling, and equipment for deployment at our North American production sites. This role will be critical in ensuring the successful manufacturing of high-precision components and assemblies at scale, focusing on quality, efficiency, and cost optimization.

The ideal candidate will be project-oriented, possess experience in designing electromechanical systems and tooling, be adept at working with complex assemblies, and utilize a data-driven approach to problem-solving. Proficiency in 3D CAD software is required to create mechanical part models and assemblies, as well as to generate 2D detailed drawings for fabrication.

This position necessitates a proactive approach and requires collaborative engagement with our Product Design and Test Engineering teams, Supply Chain, Quality, Manufacturing, and Operations team members.

Key responsibilities encompass the design and development of new manufacturing processes, troubleshooting, fine-tuning, validation, and the deployment of processes and tooling into production. Additional responsibilities include drafting tooling and equipment specifications, project management, managing project scope and schedule, developing process control (SPC) and quality plans, writing work instructions, and conducting training. The incumbent must be capable of resolving complex issues as they arise on the production floor while maintaining a strategic view of the overall objective.

What you'll do

• Create mechanical 3D CAD models and 2D fabrication drawings
• Lead the design of high-precision fixtures, tools, and equipment for electromechanical assembly and testing
• Apply DOE, PFMEA, and other industry-standard tools to identify risks and optimize process parameters
• Execute rapid prototyping, proof-of-concept studies, and process/tooling validation
• Define process equipment requirements, develop comprehensive RFQs, and lead procurement engineering from specification to sourcing
• Design actuators, select sensors and pneumatic components, develop machine BOMs, and define COTS part specifications
• Conduct equipment process capability (Cpk & GR&R) validation tests and publish results
• Generate equipment documentation, including test plans, operation, troubleshooting, and maintenance manuals
• Train and hand off equipment to Operations/production staff
• Participate in failure root cause and corrective action analysis using 8D methodology

What you'll bring

• Bachelor's or Master's degree in Mechanical Engineering, Manufacturing Engineering, Mechatronics, or a related field
• 5+ years of experience in mechanical or electromechanical equipment design, FAT/SAT process
• Hands-on experience and ability to supervise mechanical assembly, wiring, plumbing, and light machine shop skills
• Proficient in 3D CAD design, GD&T, and drafting (Solidworks ideal)
• Strong analytical and problem-solving skills
• Excellent communication, collaboration, organizational, and prioritization skills
• Proficient with Google Apps suite
• Knowledgeable in process validation testing and statistical tools (JMP or Minitab)
• Valid passport and ability to travel in North America (10-25% max)
• Must be available to work daily at the Menlo Park, CA facility

$115,000 - $136,000 a year

This position is onsite at our Menlo Park HQ . The salary will be adjusted to reflect local market conditions based on employee location as well as the experience of the employee. Along with the base salary, Mainspring offers pre-IPO stock options + benefits.

Does your experience not meet all of our posted requirements? Studies have shown that some people are less likely to apply to positions unless they meet every listed requirement. At Mainspring, we are committed to building a diverse, inclusive, flexible, and collaborative environment, so if you want to help us transition the world to clean and affordable electricity, and don't meet all posted requirements for a particular role, we'd still love to hear from you. Mainspring can sometimes be flexible enough to shift responsibilities for the right person, or otherwise identify open or upcoming roles that may better fit your professional background.

In more traditional words, Mainspring Energy, Inc is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, or protected veteran status and will not be discriminated against on the basis of disability.

This compensation and benefits information is based on Mainspring Energy's estimate as of the date of publication and may be modified in the future. We generally do not negotiate on salary once we have made an offer. The level of pay within the range will depend on a variety of job-related factors that may include location, relevant prior experience and/or education, or particular skills and expertise. New hires joining the company tend to be paid within the starting base pay range noted above, with opportunities to increase pay over time based on development of additional skills, competencies, and company-specific knowledge.

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.