Stefanie is an open-source developer and maintainer of scikit-learn, contributing also to related libraries. She trained and taught at LeWagon (2022–2023), interned with scikit-learn (2023), and worked at muffintech (2023) before joining probabl’s open-source team in 2024. She holds a PhD in History from the University of Potsdam (2021) and was active on Wikipedia as a writer and mentor (2011–2014).