Amazon VP and CTO Werner Vogels hosts a fireside chat with three leaders in the start-up community. Werner will sit down with Eliot Horowitz, CTO of MongoDB, to discuss how MongoDB sees the cloud evolving and their role in the AWS ecosystem; Jeff Lawson, CEO of Twilio, to discuss how Twilio uses, manages, and measures APIs and how the cloud helps; and Valentino Volonghi, Chief Architect at Adroll, to discuss the role of DynamoDB in building an advertising business that bids more than 10 billion impressions per day.