---
title: 'End of Line Technician at Mainspring Energy'
canonical: 'https://feeny.ai/job/end-of-line-technician-mainspring-energy-monterrey-h5p71j121x5p'
type: 'job'
last_seen: '2026-11-08'
---

# End of Line Technician at Mainspring Energy

- **Company:** Mainspring Energy
- **Location:** Monterrey, Mexico
- **Compensation:** $13k–$16k
- **Work type:** onsite
- **Posted:** 2026-10-22
- **Last confirmed live:** 2026-11-08
- **Apply:** https://jobs.lever.co/mainspringenergy/0a8534a7-3a9f-4838-8dc0-4718570fd792

## Job description

## 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

Job Overview Mainspring is seeking a motivated and technically skilled End of Line Technician to join our Mainspring Monterrey operation 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 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, in collaboration with our contract manufacturer.

## Responsibilities

- Collaborate: Partner with cross-functional operation and test teams in a dynamic, fast-paced production and test environment, and provide support for LGen owned by Mainspring

- 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 product validation, emissions testing, and eBox testing is a strong plus

- 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

- Fluent in English and Spanish

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.

## About Mainspring Energy

## Company Overview
- **One-liner**: Mainspring Energy designs and manufactures fuel-flexible linear generators that provide low-emission, dispatchable onsite power for utilities, data centers, and industrial customers.
- **Entity Type**: Private (Series F)
- **Headquarters**: Menlo Park, California, United States
- **Founded**: 2010
- **Founders**: Shannon Miller

## Core Business
- Primary industry: Electric Power Generation
- Target customers: B2B – utilities, data center developers, enterprise, industrial
- Mission statement: "Redefining how local power is delivered to capacity constrained companies and communities" – enabling clean, reliable, and fuel-flexible power.

## Products & Services
- **[Linear Generator (LGen)]**: A flameless, fuel-flexible generator that converts gaseous fuels (natural gas, biogas, hydrogen, propane) into electricity with near-zero NOx emissions. Modular (0.25 MW per unit), fast-ramping (0-100% dispatchable), 46% electrical efficiency (LHV). Standardized 2.5 MW configuration (10 units). Suitable for grid-parallel or grid-independent operation, microgrids, and balancing renewables.

## Market Standing
- **Valuation/Market Cap**: Not disclosed (private company)
- **Key Metrics**: Annual revenue $117M (latest fiscal year); total funding $813M; 407 employees
- **Notable Investors/Partners**: General Catalyst (led Series F, 2025, $258M), Lightrock (led Series E, 2022, $140M), BloombergNEF (grant), and others.
- **Growth Signals**: Powering the largest U.S. EV truck charging depot; >1 GW of capacity trusted by Fortune 500 companies and utilities; headcount growing +3.4% YoY; job postings up +121.4% YoY (62 active openings); recently expanded into data center market.

## Competitive Advantages
- **Fuel Flexibility**: Single generator can seamlessly switch between natural gas, RNG, hydrogen, and propane without hardware retrofits.
- **Near-Zero Emissions**: <1.5 ppm NOx (0.05 lb/MWh) – meets stringent air quality standards.
- **Dispatchability**: 0-100% load following, grid-independent operation, capable of firming renewables.
- **Low Maintenance**: Only two moving parts, no oil changes, modular design reduces downtime.
- **High Efficiency**: 46% electrical efficiency (LHV) across all scales.
- **Fast Deployment**: Factory-built, skid-mounted units enable rapid installation.

## Strategic Focus
- Scaling manufacturing and deployment to meet growing demand from data centers and utilities.
- Advancing hydrogen and biogas compatibility to support long-term decarbonization.
- Expanding standardized 2.5 MW configurations to lower installed cost and accelerate timelines.
- Building a diverse, cross-disciplinary team to drive innovation in power generation.

## Why Work Here
- Culture of inclusion, respect, and collaboration across engineering, operations, and field teams.
- Emphasis on growth: "We invest in your growth because progress requires people who keep getting better."
- Hybrid/Remote options: headquarters in Menlo Park, manufacturing facilities, and remote field service roles.
- Active hiring across engineering (mechanical, electrical, software), operations, supply chain, and field service.
- Competitive salary ranges (e.g., Engineer ~$107k, Controls Engineer ~$109k, Manufacturing Engineer ~$91k) plus benefits.
- Diverse talent origins from Tesla, Stanford, Apple, SunPower, and other top clean energy companies.

## Sources
1. [mainspringenergy.com/company](https://www.mainspringenergy.com/company)
2. [mainspringenergy.com/careers](https://www.mainspringenergy.com/careers)
3. [jobs.lever.co/mainspringenergy](https://jobs.lever.co/mainspringenergy)
4. [linkedin.com/company/mainspringenergy](https://www.linkedin.com/company/mainspringenergy)
5. [mainspringenergy.com/product](https://www.mainspringenergy.com/product)

## Other roles at Mainspring Energy

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- [Senior Executive Assistant](https://feeny.ai/job/senior-executive-assistant-mainspring-energy-menlo-park-889dc1ea5q95) — Menlo Park, CA
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- [Software Deployment Operations Manager](https://feeny.ai/job/software-deployment-operations-manager-mainspring-energy-menlo-park-x33w829s6ape) — Menlo Park, CA
- [Vice President, Electrical Engineering](https://feeny.ai/job/vice-president-electrical-engineering-mainspring-energy-menlo-park-p78zqkakjf87) — Menlo Park, CA