Multi-environment three-tier web application spanning production, staging, testing, and development on AWS with isolated VPCs and consistent architecture across all tiers. Each environment features a WAF-protected CloudFront CDN, Application Load Balancer, EC2 compute instances across two availability zones, RDS databases with primary-standby replication, and ElastiCache clusters for session management. Data flows from users through CloudFront and WAF to the ALB, which routes traffic to private EC2 instances in separate subnets, while RDS and ElastiCache remain isolated in their own private subnets per AZ. This architecture demonstrates environment parity and high availability best practices, enabling teams to test changes safely in lower environments before production deployment. Fork and customize this diagram on Diagrams.so to adjust instance types, add additional services, or modify CIDR ranges for your organization's requirements.