End of Line Technician

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 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