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 www.mainspringenergy.com

Job Overview

Mainspring is seeking a motivated and technically skilled End of Line Technician to join our growing Product Testing team. This role is ideal for individuals who thrive in a fast-paced, hands-on environment, enjoy mechanical and electromechanical work, and are energized by troubleshooting, testing, and continuous improvement.

As an End of Line Technician, you will play a critical role in the assembly, testing, validation, and occasional field deployment of our next-generation linear generator technology. You will perform mechanical and electronics assembly, diagnostics, retrofits, functional testing, core validation, emissions testing, and electronics box (eBox) testing, primarily in-house, with limited field work to support on-site testing or retrofit activities.

Responsibilities

Collaborate: Partner with cross-functional build and test teams in a dynamic, fast-paced production and test environment, and provide support for limited on-site field activities.
Mechanical & Electronics Assembly: Assemble mechanical and electromechanical generator components and subassemblies following established procedures, identifying opportunities for process improvements.
Troubleshoot, Repair & Retrofit: Diagnose and repair mechanical systems and electronic control/power electronics boxes, perform in-house and field retrofits as needed, and implement design updates with engineers.
Testing & Validation: Execute comprehensive testing, including core validation, emissions testing, eBox testing, and general generator system functional testing across lab, production, and limited field environments.
Inspect & Document: Perform thorough inspections, document test results, failures, retrofit actions, and corrective measures, providing actionable feedback to the engineering team.
Continuous Improvement: Contribute to process improvements focused on safety, throughput, retrofit efficiency, and operational effectiveness in a high-tempo environment.

Qualifications

Minimum 3 years of hands-on mechanical assembly and/or repair experience; experience in fast-paced manufacturing, automotive, power generation, or heavy equipment environments is a plus.
Experience with electronics diagnostics, troubleshooting, and retrofit implementation, including control boxes, sensors, wiring harnesses, and connectors.
Knowledge of or experience with core validation, emissions testing, and eBox testing is a strong plus.
Willingness and ability to perform limited field work, including occasional on-site testing or retrofit support.
Proven ability to manage multiple tasks, adapt to changing priorities, and maintain a strong commitment to safety and quality.
Proficiency with precision measurement tools (micrometers, bore gauges, gauge blocks) capable of measurements down to 0.001”.
Familiarity with software tools, data logging, and test documentation systems is a plus.
Forklift or heavy equipment operation experience is a plus.
Possession of a California Class A Commercial Driver’s License (CDL) is a plus.

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.

28 - 37 USD

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.

See more open positions at Mainspring Energy

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