In this AWS re:Invent 2023 session, Matthew Bonig, Chief Cloud Architect at Defiance Digital, shares advanced AWS CDK best practices and lessons learned from 4 years of use. He covers key topics including organizing code, managing stacks, handling external data, and implementing robust testing strategies. Bonig demonstrates these concepts through a multi-region ECS-based website example, showcasing how to build efficient and maintainable infrastructure as code using CDK. The presentation emphasizes the importance of proper construct design, effective use of aspects, and leveraging CDK's powerful testing capabilities to ensure reliable deployments. Attendees gain valuable insights into optimizing their CDK workflows and avoiding common pitfalls in complex infrastructure projects.