Ari Font Llitjós is the Director of Engineering of Twitter's Machine Learning Platform, seeking to improve Twitter by enabling advanced and ethical AI. She is also the Engineering Site Lead for the New York City office.

Previously, Ari was director of Product Development and Design Principal at IBM Watson (now Data and AI), and Director of Emerging Technologies at IBM Research, where she spearheaded AI Challenges and IBM’s Q Program, leading design and development of IBM's Quantum commercial offerings as well as the Quantum Experience and IBM's open-source SDK for writing Quantum experiments, programs and applications.