End of Line Technician

Mainspring Energy•Menlo Park, CA

1d•$28 - $37•Onsite

About The Position

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.

Requirements

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.
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 0.001â.

Nice To Haves

Knowledge of or experience with core validation, emissions testing, and eBox testing is a strong plus.
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 Driverâs License (CDL) is a plus.

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.