Job Description

Company Overview

Mainspring Energy is revolutionizing power generation with the worlds most flexible and adaptable onsite power generator, 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 technology with near-zero NOx emissions.

Backed by top-tier investors such as Khosla Ventures, Bill Gates, American Electric Power, and Lightrock, Mainspring designs, manufactures and delivers its products to customers across the U.S. today, and were 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 were 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 Mainsprings 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 is seeking Senior Level Mechanical Engineers with a focus on designing hardware that requires thermal and fluids analysis. In this role, you will design hardware for air and liquid handling systems. The Engineer will develop new concepts and manage existing concepts through development, deployment, and manufacturing. Mainspring is a great place for engineers with a variety of areas of deep expertise, who like to solve challenging cross-functional problems with a mix of computational analysis, hands-on engineering and team effort.

• Lead and participate in brainstorming activities to develop novel ways to improve all aspects of the Linear Generator
• Develop and optimize key thermal subsystems of the Linear Generator to drive down cost, improve performance, and deliver high reliability
• Lead projects, and project teams, within the thermal subsystems and contribute to projects in other subsystems
• Work with reliability and test teams to validate systems and components with fast cycles of learning for deployment into the next generation of Linear Generators
• Collaborate cross-functionally with manufacturing engineering, NPI, and external suppliers to rapidly deploy new designs into production

• BS Degree in Mechanical Engineering or a similar engineering field from an accredited institution + 5 years of relevant industry experience or MS + 4 years of relevant industry experience
• Direct experience designing air or liquid handling systems, with demonstrated engineering fundamentals in thermo-fluid system design
• Fluent in SolidWorks or comparable CAD package. Experience with using PDM or a similar CAD version control system is preferred
• Experience with finite element analysis (structural, thermal, or fluids)
• Familiarity with 1D or 3D thermal systems design simulation tools
• Experience working with suppliers to develop and qualify new components
• Experience with various manufacturing processes such as sheet metal forming, machining, and plastics molding and forming.
• Demonstrated attention to detail with the ability to generate and review design documentation, bill of materials, work instructions and test plans and reports
• Experience utilizing GD&T is ideal
• Ability to work independently, manage multiple projects in a fast-paced environment, and demonstrate leadership and mentoring abilities
• Experience leading projects through a full design lifecycle from concept through manufacturing support is preferred
• Interest in developing creative and cost effective solutions to enable the deployment of zero carbon energy technology at large scale

$126,000 - $148,000 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 dont meet all posted requirements for a particular role, wed 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.

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