In this AWS re:Invent 2023 session, Skye Hart and Chris Munns provide valuable insights on scaling applications for the first 10 million users on AWS. They discuss best practices for building scalable architectures, starting with a simple stack using AWS Amplify, App Runner, and Amazon Aurora Serverless v2. The presentation covers key concepts like decoupling frontend and backend, leveraging managed services, and implementing caching strategies. As the application grows, they explore techniques for decomposing monolithic architectures into microservices, using event-driven patterns, and optimizing database performance. The speakers emphasize the importance of monitoring and observability tools like CloudWatch and X-Ray for identifying bottlenecks and areas for improvement. Throughout the talk, they highlight AWS services that can help developers build resilient, cost-effective, and highly scalable applications without managing underlying infrastructure.