End of Line Technician

About Mainspring Mainspring Energy manufactures and delivers fuel-flexible, low-emissions local power solutions that rapidly add new capacity and deliver reliable, affordable, and sustainable electric power. The company began commercial shipments of its Mainspring Linear Generators in 2020 and today has hundreds of megawatts in advanced development and field operations for leading Fortune 500 companies, data centers, and utilities. Mainspring also partners with global energy leaders including AEP, NextEra Energy Resources, Schneider Electric, and more. The core values that ground our work, guide our decisions, and connect us together: Pragmatic Optimism Excellence without Ego Proactive Collaboration

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.

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

Minimum 3 years of hands-on expereince with mechanical assembly and/or repair 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

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