Explore three essential design patterns for modernizing legacy applications in this AWS re:Invent 2025 conference session. Discover how the Strangler Fig pattern enables incremental architectural modernization away from monolithic systems, while the Circuit Breaker pattern protects against cascading failures and supports self-healing system design. Learn to implement Sagas for managing distributed transactions and system interactions, including compensation strategies and maintaining data consistency across microservices. Gain practical insights into how these powerful architectural patterns create resilient pathways for transforming legacy systems into modern, scalable architectures and understand their strategic application in your own transformation journey.