Staff Mechanical Engineer - Structures & Alignment

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

Staff Mechanical Engineer – Structures & Alignment
Mainspring’s Linear Generator is fundamentally different from a traditional engine.
Instead of rotary motion and a crankshaft, our system converts linear oscillation directly into electricity. A low-temperature, flameless reaction accelerates pistons and its translator shaft wrapped with permanent magnets through stator coils. Air-spring chambers reverse the motion —  generating power with high efficiency and ultra-low emissions.
Critically, the translator shaft and pistons float on precision air bearings, riding on a thin film of pressurized air. This minimizes friction and wear — but it also removes rigid mechanical constraints. The translator must remain precisely aligned within tight tolerances across the full cylinder length while traveling at resonance under dynamic loads.
This architecture is elegant — and mechanically unforgiving.