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Sebastien Ballesteros is a Senior Software Engineer at DuckDuckGo since 2020, where leadership in rewriting the search engine result page in React has led to increased engineer productivity and a cultural shift towards a design system. Previously, experience includes volunteering with Coral Gardeners for their e-commerce platform and live streaming project in 2021, and senior full-stack engineering at Code for Science and Society from 2019 to 2020, focusing on preprint review products. Sebastien co-founded Standard Analytics from 2014 to 2019, guiding scholarly publishers through digital transition, and held postdoctoral fellowships at Princeton University and the University of Lisbon, developing infrastructure and methods for infectious disease modeling. Academic qualifications include a PhD and Master's degree in Ecology, Evolution, Systematics, and Population Biology from École normale supérieure, and a Bachelor's degree from AgroParisTech.