This session explores building low-latency, event-driven applications using serverless technologies. Maria Vizcaino from AWS and Brena Moore from Second Dinner discuss strategies for optimizing backend performance and reducing latency. They cover synchronous and asynchronous communication patterns, multi-region deployments, and real-time data updates using services like AWS Lambda, API Gateway, DynamoDB, and IoT Core. Brena provides insights on how these concepts are applied in the popular mobile game Marvel Snap, sharing their experiences scaling to millions of users. The presenters offer practical tips on load testing, optimizing Lambda functions, implementing websockets, and leveraging event-driven architectures to build responsive applications. Developers will learn architectural patterns and best practices to create high-performing serverless applications that can handle real-time updates at scale.