TRECQ

Staff Mechanical Design Engineer – Electromechanical

EngineeringStaffonsiteMenlo Park, CA
SalaryPosted Jun 18, 2026

About this role

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

About the Role

Mainspring is seeking a Staff Mechanical Design Engineer to own the design of electrical enclosures and power electronics packaging for the Linear Generator. You’ll lead projects from requirements through design, review, testing, and release, working closely with EE, manufacturing, and suppliers, with potential for direct reports. Ideal candidates will have a strong combination of technical expertise and the drive to solve complex problems in a collaborative environment.

About Mainspringenergy

Interested?

Find the right person, then reach out. Trying more than one channel only helps your odds.

1
Find who to reach
Pick the person worth a direct note. Reveal a real email (one credit) or find a likely one.
New accounts start with 3 free reveals.
2
Reach out
Pick someone above, then draft an email or a LinkedIn note to them.
3
Or apply on their site
The front-door route, plus TRECQ drafts your application answers to paste.
Apply on Mainspringenergy ↗
TRECQ writes your "why this company / why you" to paste into the form.