Rick van Hattem is an entrepreneur who has founded and sold several successful start-ups. His expertise is in designing and scaling system architectures to many millions of users and/or large amounts of data that need to be accessed in real time. He’s been programming for well over 25 years and has over 20 years of experience with Python. Rick has done consulting for many companies including (Y-Combinator) start-ups, banks, and airports. One of the start-ups he founded, Fashiolista.com, was one of the largest social networks for fashion in the world, featuring millions of users.