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Peak Energy   Job Title:  Reliability Engineer Intern   Location:  Burlingame, CA   Department:  ESS Engineering   Reports To:  Staff Reliability Engineer   Position Type:  Internship (Fall 2026)   About the Job   Reliability engineering works at the intersection of design, test, systems, and commercial teams to predict, validate, and optimize when and how our product will fail in the field. We’re looking for a hardware engineer comfortable with data analysis automation to help scale ESS reliability by building custom, integrated python tools, implementing reliability studies, and getting hands-on with testing of parts like HV battery packs, devices, and electronics.   The subject matter is highly teachable, and the ideal candidate is an enthusiastic learner with strong engineering first principles. This is a unique opportunity to learn a rarely-taught subject area in a fast-paced startup environment, and is a great stepping-stone for aspiring reliability, test, or design engineers.      About the Role – Reliability Engineer Intern   Build custom data pipelines in python to connect and analyze dozens of reliability tests and calculate progress against product requirements Replace off-the-shelf software to automate physics and statistical analyses that predict component lifetime in fatigue and environmental stresses Collaborate with design and test engineers to analyze field usage, implement accelerated life calculations, and optimize test conditions Perform trade and sensitivity studies that guide commercial contract decisions by predicting the maintenance and downtime of new projects or hardware designs   Build, automate, and execute tests related to your subject area of experience Diverse opportunities to deep dive into research papers, literature studies, failure physics, failure analysis, etc. depending on your specific interest and background     What You'll Bring - Qualifications:    Pursuing a mechanical engineering, electrical engineering, physics, or equivalent   Strong understanding of engineering fundamentals in your area of study   Strong understanding of python, data analysis, and Git usage in small repositories   Ability to work quickly and leverage AI tools in a fast-paced startup environment     Preferred Qualifications:   Experience with hands-on hardware testing and test automation   Experience with high voltage batteries, power electronics, or similar hardware   Exposure to hardware reliability first principles     Peak Energy is committed to building a diverse and inclusive workforce. We strongly encourage women, people of color, and individuals from underrepresented groups to apply. We value skills, potential, and perspective over specific credentials. If you’re excited about this role but your experience doesn’t look perfect on paper, we still want to hear from you.   Our Core Values   Speed Through Focus  - Move fast but understand why. Focus on the goal, don't sacrifice quality.    Mission Over Self  - It's about the greater good; confident humility. Take ownership and accountability.    Face the Brutal Truth  - Transparency, honesty, big picture curiosity. Fearless decision making.    Be a Good Person  - Kindness, collaboration and teamwork.     Compensat