Three-tier AWS web app using ECS Fargate, RDS PostgreSQL, and ElastiCache Redis across two availability zones for fault tolerance. CloudFront and WAF protect static assets and traffic at the edge, while an Application Load Balancer distributes requests to containerized Fargate tasks in private subnets. RDS Primary-Standby replication and ElastiCache Redis replicas ensure data durability and read performance, with IAM Task Roles, CloudWatch Logs, and X-Ray Tracing providing security and observability. Fork this diagram to customize VPC CIDR blocks, instance types, or add additional AZs for your production workload.