Explore the development of Serverlesspresso, a contactless, serverless order management system for a physical coffee bar, in this comprehensive conference talk. Dive deep into the event-driven architecture built using serverless technology, covering architectural choices, service decisions, and the development process. Learn about AWS serverless services utilized in the application, including Lambda, Step Functions, and EventBridge. Discover how to handle asynchronous responses with real-time updates and gain insights into building scalable, low-cost production applications using serverless technologies. Walk through the high-level architecture, QR validator service, order processor service, and order manager service to understand the inner workings of this innovative system.