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Job Title:  Functional Systems Lead   Location: Burlingame, CA Department: ESS Engineering Reports to: CTO Position Type: Full Time   About Peak Energy Peak Energy is the first American venture to advance globally proven Sodium-Ion battery systems as the storage standard for the new era of renewable energy on a resilient grid. Sodium-Ion is cheap, readily available and safe, making it the leading contender in a rapidly evolving market.   Our leadership team is powered by decades of expertise in scaling gigawatt-level innovation at world-class companies such as Tesla, Northvolt, SunPower, Fluence, and Enovix. We are backed by strategic investment and product partners such as TDK Ventures and Eclipse Ventures.     About the Role - Functional Systems Lead: Peak Energy is seeking a  Functional Systems Lead  to own system-level architecture, requirements, and integration across embedded software, electrical systems, and controls for our energy storage products.  This role sits at the intersection of embedded systems, electrical engineering, and system modeling, ensuring our products are safe, reliable, and performant from cell to grid.  You will lead the definition of functional requirements, system behavior, and safety architecture, while partnering closely with embedded, hardware, and modeling teams—and may directly oversee embedded software development for safety-critical functions.  This is a highly cross-functional, hands-on leadership role ideal for someone who thrives in ambiguity and wants to shape both product and engineering direction.    What You'll Do (Responsibilities): Own system-level architecture and functional definition for energy storage systems (BMS, controls, protections, EMS integration)   Define and manage system requirements, interfaces, and traceability from cell → module → pack → system → grid   Lead functional safety architecture , including fault detection, diagnostics, and protection strategies   Drive systems integration across embedded software, power electronics, thermal, and mechanical subsystems   Partner with embedded teams to guide development of real-time, safety-critical firmware (controls, protections, communication)   Develop and validate system models (performance, thermal, electrical behavior, fault conditions) to inform design decisions   Lead verification & validation strategy (DV/PV), including test definition, coverage, and requirements validation   Support certification efforts (UL, IEC, IEEE), ensuring compliance at the system level   Identify system risks and drive DFMEA, fault analysis, and mitigation strategies    Build and mentor a high-performing systems/embedded team , setting clear ownership and technical direction     What You'll Bring (Qualifications): 10+ years of experience in  systems engineering, embedded systems, or electrical engineering , with 3–5+ years in technical leadership   Strong background in  safety-critical systems  (battery systems, automotive, aerospace, industrial, or similar)   Experience defining and managing  system requirements, interfaces, and architecture    Deep understanding of  embedded systems and real-time controls    Familiarity with  electrical systems  (power electronics, battery systems, sensing, protections)   Experience with  system modeling and simulation  (MATLAB/Simulink, Python, or similar)   Strong experience with  DFMEA, fault handling, and system reliability engineering    Experience driving  cross-functional integration  across