AWS Multi-AZ three-tier architecture spans two availability zones with CloudFront CDN, WAF, and Route 53 protecting user traffic at the edge. Application Load Balancers route requests to EC2 t3.medium, ECS Fargate, and Lambda compute across private subnets, while RDS Primary/Standby and DynamoDB Global Tables ensure data resilience and low-latency reads. This design demonstrates AWS best practices for fault tolerance, auto-scaling, and operational visibility through CloudWatch and CloudTrail. Fork and customize this diagram on Diagrams.so to match your VPC CIDR blocks, instance types, and monitoring requirements. The multi-AZ deployment with cross-region DynamoDB replication provides RPO/RTO targets suitable for mission-critical workloads.