Multi-AZ AWS microservices architecture using ECS with three independent services—Auth, Orders, and Notifications—deployed across two availability zones for high availability. Application Load Balancers route traffic to containerized services in private subnets, while Redis ElastiCache provides distributed caching and AWS Cloud Map enables service discovery. Secrets Manager secures sensitive credentials, and CodePipeline with CodeDeploy automate container deployments from Amazon ECR. This pattern demonstrates AWS best practices for fault isolation, zero-downtime deployments, and operational resilience in production microservices workloads.