This deep dive session explores how Amazon ECS (Elastic Container Service) is built for resilience and availability. Maish Saidel-Keesing and Malcolm Featonby discuss ECS architecture, design principles, and operational practices that enable high availability. They cover concepts like static stability, pre-scaling, and partitioning to absorb failures. The speakers explain how ECS leverages AWS regions and availability zones for infrastructure isolation. They also detail ECS deployment strategies, continuous improvement processes, and tools like COEs (Correction of Errors) used to enhance service reliability. The session provides insights into how AWS builds and operates ECS to provide a secure, resilient foundation for customer applications.