Staff Materials and Process Engineer
mainspringenergy
Staff Mechanical Engineer - Battery Design
mainspringenergy· Electromechanical
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 Energy is seeking a Staff Mechanical Engineer – Battery Design to lead battery pack and module development for current and future energy platforms.
As Mainspring's internal battery technical authority, you will help define next-generation battery architectures for future products while improving systems already in production. You'll partner closely with battery suppliers to influence pack and module designs and drive solutions that balance safety, reliability, manufacturability, performance, and cost. You'll influence key decisions across cell integration, thermal management, safety, and system architecture while working at the intersection of mechanical, electrical, and battery engineering.
Our battery systems do far more than just store energy. They are the dynamic core of our linear generator platform. Tightly integrated into every sub-system, they act as the ultimate performance driver—sparking to life during grid-islanded startups, taming dynamic transient loads, and delivering resilient long-duration standby. This role is your chance to tackle complex battery engineering challenges head-on, drive our supplier strategy, and ensure our systems deliver rock-solid, scalable reliability in the real world.
The ideal candidate combines deep lithium-ion battery pack expertise with strong supplier-management experience and the ability to translate system requirements into robust production-ready designs.
Frequently Asked Questions
What is the salary for the Staff Mechanical Engineer - Battery Design role at mainspringenergy?
The listed salary for this Staff Mechanical Engineer - Battery Design position at mainspringenergy is USD 172K–203K. This is an Salary role.
Where is the Staff Mechanical Engineer - Battery Design position at mainspringenergy located?
This Staff Mechanical Engineer - Battery Design role at mainspringenergy is based in Menlo Park, CA. The position is listed as on-site or hybrid. Check the full job description or apply directly to confirm the work arrangement.
Is the Staff Mechanical Engineer - Battery Design role at mainspringenergy full-time or part-time?
This is listed as a Salary position. It is posted as a Staff Mechanical Engineer - Battery Design role in the Electromechanical department at mainspringenergy.
Which team or department does the Staff Mechanical Engineer - Battery Design at mainspringenergy belong to?
This Staff Mechanical Engineer - Battery Design position is part of the Electromechanical department at mainspringenergy. See the full job description for more information about the team structure and responsibilities.
How do I apply for the Staff Mechanical Engineer - Battery Design position at mainspringenergy?
Click the "Apply Now" button on this page. You will be redirected to mainspringenergy's official application portal hosted on lever where you can submit your application directly.
When was the Staff Mechanical Engineer - Battery Design job at mainspringenergy posted?
This Staff Mechanical Engineer - Battery Design position at mainspringenergy was posted on Jun 18, 2026. Apply as soon as possible — early applications are often reviewed first.
Staff Mechanical Engineer - Battery Design
mainspringenergy · 💰 USD 172K–203K
You'll be redirected to mainspringenergy's official application page on Lever.