E24: Open-Source Messaging & Collaboration with Mattermost

Ian Tien is Co-founder & CEO of Mattermost, the open-source messaging and collaboration platform with customers including Fastly, Samsung, Bosch, NASA, AIG, Wealthfront, and the US Air Force. The company has multiple open-source projects focused on collaboration and 34K+ stars across them all. 

Mattermost has raised $70M from investors such as YC and Redpoint.