Multi-AZ three-tier web infrastructure combining CloudFront CDN, WAF, and Route 53 for global content delivery and DDoS protection. Traffic flows through Application Load Balancers in two availability zones to ECS clusters running t3.large instances with auto-scaling, while RDS Primary/Standby databases and ElastiCache replicas ensure data resilience across AZ-1 and AZ-2. This architecture demonstrates AWS best practices for fault tolerance, horizontal scaling, and separation of concerns across presentation, application, and data tiers. Fork this diagram on Diagrams.so to customize subnets, instance types, or add additional AWS services like Lambda or SNS. The design supports zero-downtime deployments and automatic failover, making it ideal for production SaaS platforms and e-commerce applications.