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Job Title: Staff Reliability Engineer Location: Burlingame, CA Department: ESS Engineering Reports To: Staff Reliability Engineer 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, Apple, Powin, Enovix, Zipline, Solid Power, and Fluence. We are backed by strategic investment and product partners such as TDK Ventures and Eclipse Ventures. We are a team of engineers, operators, entrepreneurs, and partners driven by a shared ambition to set the new performance standard for renewable energy and grid resilience.   About the Role – Staff Reliability Engineer Peak Energy is looking for a Staff Reliability Engineer to help scale ESS hardware reliability with a focus on HV electronics, devices, and power conversion. You will work cross-functionally to realize industry-leading reliability across all aspects of the product life cycle, from concept development through field deployment. This role sits at the intersection of design, testing, manufacturing, and field operations — with direct influence on architecture decisions and reliability outcomes that matter most. You will creatively apply reliability expertise in a fast-paced, hands-on environment where your work has immediate and measurable impact. The ideal candidate brings deep technical expertise, a proactive ownership mindset, and the ability to think critically and act decisively in a dynamic startup environment.   What You'll Do Take independent DfR ownership for existing subsystem reliability and a lead DfR role for future products, with a focus on HV electronics, devices, and power conversion Fully develop reliability test programs (DV, PV, ORT) by leading DFMEA, defining mission profiles, analyzing test acceleration, and specifying test requirements Build and contribute to custom Python reliability analysis and modeling tools to automate workflows for life prediction, test design, test/field data, and reporting Define reliability requirements and acceptance criteria at key program milestones and clearly communicate risk and reliability confidence to engineering leadership Develop physics-of-failure lifetime models and close the loop by performing failure root cause analysis and statistical analyses of test and field reliability data Partner with the SIE team and suppliers to verify component quality by overseeing outsourced testing and defining qualification and inspection requirements Collaborate across all teams to embed DfR principles into engineering decisions throughout the product cycle, including early architecture decisions, manufacturing process development, and cost-down projects   What You'll Bring Bachelor's or master's degree in Electrical Engineering, Mechanical Engineering, Reliability Engineering, Materials Science, or a related field 5+ years of experience in hardware reliability engineering in power electronics, high-voltage systems, or consumer electronics Strong understanding of reliability engineering principles including statistics, data analysis, physics-of-failure, lifetime prediction models, accelerated life testing, and DFMEA Demonstrated ability to independently lead product reliability through multiple stages of development Proficiency using statistical analysis tools in Python or equivalent for modeling and data analysis Strong documentation and technical communication skills — able to clearly present findings and reliability principles to cross-functional and leadership teams Ability to think critically and act decis