Field Service Technician; San Diego, CA

Company Overview

Mainspring Energy is revolutionizing power generation with the world’s most flexible local power generation technology, the Mainspring Linear Generator. Commercial, industrial, and utility leaders are choosing Mainspring over traditional options like engines, turbines, and fuel cells to quickly and reliably deliver local power for EV charging, commercial facilities, data centers, and grid-scale operations.

The Mainspring Linear Generator is fuel flexible, ramps up and down to meet demand, and uses a flameless reaction with near-zero NOx emissions. It is backed by top-tier investors including Khosla Ventures, Bill Gates, American Electric Power, Lightrock, and General Catalyst. Mainspring designs, manufactures, and delivers its products to customers across the U.S., and is scaling for international expansion.

Our mission is to create an affordable, reliable, net-zero carbon grid. We’re expanding within an $816B global electricity equipment market and hiring talent worldwide.

• Pragmatic Optimism – Balancing ambition and creativity with practicality to solve problems efficiently.
• Excellence without Ego – Delivering the best customer experience and applying deep technical rigor.
• Proactive Collaboration – Seeking diverse skills and perspectives across teams.

More information can be found at

We are searching for mechanically inclined individuals to join our Field Service team. In this role, you will complete planned and reactive service operations on our generators, maintaining uptime, availability, and performance for deployed units. You will train at our headquarters in Menlo Park, CA, then be assigned to a service region requiring travel. We offer full benefits including vacation, sick time, 401(k), and pre-IPO stock options.

• Mechanically repair and maintain components and assemblies per procedures and checklists.
• Collaborate with engineers to fix, repair, and redesign components.
• Conduct mechanical inspections and document condition information.
• Be available to work rotational on-call shifts as scheduled.

• Minimum 3 years of mechanical assembly/repair experience; automotive, aviation, or heavy equipment backgrounds are a plus.
• Experience using precision tools (.001 inches) and documenting repairs.
• Must be able to stand for long periods, lift up to 50 lbs, and wear required PPE.
• Knowledge of basic tools and torque specifications.
• Follow written and verbal work instructions on site.
• Strong communication skills; knowledge of Google Workspace is a plus.
• Team player, self-motivated, and safety oriented.
• Valid driver’s license required;
  Class A preferred.

$26 - $35 an hour

This position is onsite in San Diego, CA. Salary will be adjusted for local market and experience.

This position 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 disability.

Compensation and benefits information is estimated as of publication and may be modified in the future. Pay within the range depends on location, experience, and skills.