By leveraging "serverless architectures", startups and enterprises are building and running modern applications and services with increased agility and simplified scalability—all without managing a single server. Many applications need to manage user identities and support sign-in/sign-up. In this session, we dive deep on how to support millions of user identities, as well as how to integrate with social identity providers (such as Google and Facebook) and existing corporate directories. You learn the real-world design patterns that AWS customers use to implement authentication and authorization. By combining Amazon Cognito identity pools and user pools with API Gateway, AWS Lambda, and AWS IAM, you can add security without adding servers.