Battery Systems Engineer

EPG is currently seeking a Battery Systems Engineer for one of our partners that is an established high-voltage battery and power-electronics company bringing technology proven in demanding, high-reliability applications to a new backup-power product for AI data centers. In this position, you will own the design of a new 800V stationary battery pack and energy-storage system from architecture through first production.

Responsibilities

Own 800V stationary battery pack and ESS design: pack architecture and cell configuration. Set cycle-life, calendar-life, and thermal targets for continuous high-uptime duty. Own pack-level safety architecture and abuse tolerance. Define BMS requirements and interfaces to the converter and rack controls. Drive pack-level validation and testing.

Requirements

BS in Electrical, Mechanical, or Chemical Engineering. 5+ years of battery pack or BMS design. High-voltage (400V+) Li-ion pack design, including module architecture and BMS integration. Battery safety and abuse testing. This role is onsite in the Pacific Northwest. Must be able to work in the United States without sponsorship (US Persons only, export-control requirement).

Preferred Qualifications

Stationary ESS experience with UL 9540 / UL 9540A. Concept-to-first-production experience. NMC / Si or other high-energy-density chemistries.

Benefits

eligible for an annual performance-based bonus (typically around 7 to 8% at this level), awarded on performance after you join. Equity: a company stock option program is planned, with leadership committed to rolling it out by the end of the year. Health coverage: approximately 100% company-paid medical, dental, and vision for you and your family.

Retirement: roughly 9% 401(k) match. Location advantage: based in Everett, WA, with no Washington state income tax. The opportunity: join a well-funded, roughly 100-person company moving like a startup, building a clean-sheet 800V product from concept to production, where your work ships rather than sits on a shelf.