Senior Battery Cell Engineer

WHOOP·Boston, MA·Posted 2 October 2026

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About the role

At WHOOP, we're on a mission to unlock and inspire performance for life. WHOOP empowers members to perform at a higher level through a deeper understanding of their bodies and daily lives. WHOOP is hiring a Senior Battery Engineer focused on Cell Engineering to evaluate, qualify, and improve lithium-ion cells for current and future products. You will apply expertise in electrochemistry, cell design, testing, manufacturing, and failure analysis to ensure battery cells meet performance, safety, reliability, and product integration requirements. RESPONSIBILITIES: - Evaluate new cell designs, chemistries, form factors, and suppliers against product specifications and acceptance criteria. - Develop and execute cell qualification plans across incoming and outgoing quality control, performance, safety, reliability, environmental, and life-cycle testing. - Plan and conduct design of experiments (DOEs) to optimize cells for fit and performance needs. - Collaborate with battery system engineers to translate cell attributes into pack designs that meet overall product requirements. - Operate battery cyclers, environmental chambers, and laboratory equipment; create…

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