About Arbor Energy
What is Arbor Energy?
Arbor is a clean-energy company focused on one of the defining energy challenges of this century: delivering fast, emissions-free baseload power to meet the world's growing needs. The pitch is direct on the careers page: "Serious engineering, real responsibility, and problems worth solving."
The flagship product is ATLAS, "the first full-stack system we're building to validate Arbor's approach to clean, dependable baseload power" — a 1-megawatt pilot system that integrates a turbocompressor with CHAD, the CO₂ Heat Addition Device that brings carbon dioxide to turbine-ready conditions. Recent technical milestones disclosed on the careers page include "the team spun the turbomachinery in ATLAS to ~35,000 RPM on cold CO₂" — with "gaseous CO₂ bearings behaved as designed, the shaft was thrust-balanced in fluid CO₂, and the system held steady throughout."
A senior engineer's testimonial summarises the appeal: "A big part of what drew me to Arbor was the opportunity to apply my relatively niche rocket propulsion engineering expertise toward developing a system that can simultaneously generate baseload power while durably sequestering carbon." (Jack Mohajer, Senior Turbomachinery Engineer).
Where will I work?
Arbor is headquartered in El Segundo, CA with an active test site in San Bernardino, CA where ATLAS is being assembled and tested. Most roles — engineering (combustion, turbomachinery, mechatronics, heat exchangers), CNC machining, operations, and people — are on-site in El Segundo. The fluid-power / mechanical technician role is based in San Bernardino at the test facility.
What is the Arbor team like?
Arbor publishes three values that frame the engineering culture: Lead with love ("We champion the success of our people, partners, and planet, nurturing excellence through camaraderie and rigor"), Steward our planet ("We build for tomorrow, ensuring every bolt we tighten and every hand we lend leaves our environment stronger than we found it"), and Explore the uncharted ("We embrace the unknown with curiosity, using courage and discipline to transform uncertainty into opportunity").
The team is hiring across 14+ open roles that span combustion engineering, cycle performance, turbomachinery, heat exchangers, mechatronics, CNC machining, and high-pressure-gas testing. Team members describe the work in terms of purpose: "In Japanese, there's a word, ikigai — a sense of purpose. Arbor has given me that feeling." (Miho Beal, Head of Operations).
Work-Life Balance
Arbor offers Unlimited PTO + company holidays + a year-end winter break for full recharge. The team works on-site at the El Segundo and San Bernardino facilities, with the in-person collaboration that hardware engineering of this depth requires.
Perks and Benefits
- Unlimited PTO + company holidays + year-end winter break
- Medical, dental, vision coverage — Arbor covers the majority of costs for you AND your family
- Equity grants and refreshes tied to impact — meaningful ownership stake
- 401(k)
- Annual learning stipend to invest in your curiosity (technical, creative, or personal)
- Legal assistance + long-term support benefits designed to grow with you over time