Learn how to modernize existing applications using event-driven architecture (EDA) through practical implementation of strangler and leave/layer patterns in this 24-minute conference talk from AWS Summit Sydney 2025. Discover techniques for leveraging Amazon EventBridge, AWS Lambda, and microservices to enhance application agility, resiliency, and security while simultaneously reducing technical debt. Explore systematic approaches to decomposing monolithic applications into microservices architecture, enabling organizations to achieve faster innovation cycles, improved scalability, and enhanced maintainability. Gain insights from AWS Senior Solutions Architect Nishant Dhiman and Senior Specialist Solutions Architect Tomas Mihalyi as they demonstrate real-world strategies for architectural transformation that preserve existing functionality while introducing modern cloud-native capabilities.