Explore event sourcing and Command Query Responsibility Separation (CQRS) in microservices architecture through this 26-minute conference talk from YOW! 2016. Gain insights from Sidney Shek, an Architect at Atlassian, as he shares their experience implementing these patterns to achieve scalability and flexibility in cloud services. Learn about the benefits of event sourcing, including easy data restoration and built-in audit trails. Discover how combining event sourcing with CQRS enables seamless introduction of new functionality and improved scalability. Dive into a detailed implementation walkthrough using Scala, scalaz-streams, and AWS services like DynamoDB, Kinesis, and Lambda. Understand the motivations behind this architectural approach and its practical applications in a real-world scenario.