End of Line Technician

Mainspring Energy•Menlo Park, CA

6d•$28 - $37•Onsite

About The Position

Mainspring Energy is seeking a motivated, technically skilled End of Line Technician to join its Product Testing team. The role involves hands-on mechanical and electromechanical work in a fast-paced production and testing environment, supporting assembly, testing, validation, troubleshooting, and continuous improvement of the company’s linear generator technology. Work is primarily performed in-house, with limited field activity for on-site testing or retrofit support. The technician will assemble generator components and subassemblies; diagnose and repair mechanical systems and electronic control and power electronics boxes; implement design updates with engineers; and perform generator functional, core validation, emissions, and eBox testing. The role also includes inspecting equipment, documenting results and corrective actions, and providing feedback to engineering. The position is onsite at Mainspring’s Menlo Park headquarters. Compensation is $28–$37 per hour, adjusted for local market conditions and experience. Mainspring also offers pre-IPO company equity through Restricted Stock Units (RSUs), benefits, and a bonus.

Requirements

At least 3 years of hands-on experience with mechanical assembly and/or repair.
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.
Ability to manage multiple tasks, adapt to changing priorities, and maintain a strong commitment to safety and quality.
Proficiency with precision measurement tools such as micrometers, bore gauges, and gauge blocks, with measurement capability down to 0.001 inch.

Nice To Haves

Experience in fast-paced manufacturing, automotive, power generation, or heavy equipment environments.
Knowledge of or experience with core validation, emissions testing, and eBox testing.
Familiarity with software tools, data logging, and test documentation systems.
Forklift or heavy equipment operation experience.
California Class A Commercial Driver’s License (CDL).

Responsibilities

Collaborate with cross-functional build and test teams in a fast-paced production and test environment, and support limited on-site field activities.
Assemble mechanical and electromechanical generator components and subassemblies according to established procedures, identifying process improvement opportunities.
Diagnose and repair mechanical systems and electronic control and power electronics boxes.
Perform in-house and field retrofits as needed and implement design updates with engineers.
Execute core validation, emissions, eBox, and general generator system functional testing in lab, production, and limited field environments.
Inspect equipment and document test results, failures, retrofit actions, and corrective measures, providing actionable feedback to engineering.
Contribute to improvements in safety, throughput, retrofit efficiency, and operational effectiveness.