Zhehao Mao, a Columbia University student, won the top prize at DevFest 2012 with his Twilio-powered webhook notification app called Lerner. Lerner was inspired by the concept of webhooks and allows diverse clients to receive notifications without requiring a server with a publicly accessible IP address. The app consists of three cooperating processes: a webserver, a pub/sub server, and a client. Zhehao's goal for Lerner is to encourage the open-source community to build more clients and publishers, and he plans to use existing protocols and libraries to facilitate this process.