2026 Fall Engineering Intern

Location: [On-site — San Francisco] · Term: Fall 2026 (Sept–Dec, dates flexible) · Type: Full-time or part-time internship

Estes develops and manufactures zero-emission power systems that unlock true scale and performance for the electrification of commercial vehicle and equipment markets.

Our goal is to democratize electrification — delivering powertrain solutions at better cost and performance than diesel, for both high-volume OEMs and next-generation newcomers.

We work on transforming advanced materials into battery systems for industrial and commercial applications, most of which runs on diesel today.

The problem we're attacking is real.

Roughly 3.9 million barrels of diesel (5.8 TWh of energy) are burned every day in the U.S., mostly by commercial vehicles and equipment — emitting 1.66 megatonnes of CO₂, 353 kilotonnes of NOx, and 9.92 kilotonnes of SOx daily.

We exist to move the needle on transitioning a century-old diesel-burning industry to electric.

We're a small, deeply technical team with ambitious goals, and our interns do real engineering work (not pet projects).

As an Engineering Intern, you'll own a meaningful slice of a live project, work shoulder-to-shoulder with senior engineers, and see your contributions make it into actual systems.

You'll reason from first principles, let data drive your decisions, and design with cost and scale in mind from day one.

• Contribute to the design, build, and test of components or subsystems within our power systems (mechanical, electrical, controls, battery, manufacturing, or systems engineering — depending on your focus)