Stateful Functions is a framework, developed under the umbrella of Apache Flink, that makes it simple to build consistent stateful serverless applications. StateFun is designed to work with popular event-driven FaaS platforms like AWS Lambda, KNative, etc., and provides out-of-the-box consistent state and messaging, in a way that preserves the serverless experience and elasticity of these platforms. It is a runtime to model stateful entities that support location transparency, concurrency, scaling, and resilience. Stateful Functions is not a library that proxies state access to a database, but an independent event-driven stack replacing the traditional database. The talk will take the audience step-by-step through building and deploying a Stateful Functions application that tracks user events and runs a stateful ML classifier.