Flat Hierarchy, Intellectual Humility, and Honest Trading -- Jane Street's Cultural DNA

Jane Street's culture is built on five pillars: flat hierarchy with decentralized decision-making, intellectual humility, ethical trading, collaborative problem-solving, and a puzzle-loving community. With no CEO, no formal titles driving decisions, and a stated commitment to never imposing hidden costs on counterparties, this module unpacks what these values mean in practice and how they show up in behavioral interview evaluations.