Learn essential integration patterns and design strategies for building robust distributed systems in this comprehensive conference talk from AWS re:Invent 2025. Explore the fundamental challenges that interconnected applications face, including out-of-order delivery, retry mechanisms, idempotence requirements, and handling partial failures when systems expose APIs, publish events, call third-party services, and externalize states. Discover how to carefully evaluate integration options while managing complex system interactions through proven architectural approaches. Examine common design trade-offs architects encounter when building distributed systems and master practical navigation strategies using established design patterns demonstrated through real-world examples. Gain insights into making informed decisions about system architecture that balance reliability, performance, and maintainability in modern cloud-native environments.