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

• Annual performance bonus: 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.