Multi-AZ enterprise API aggregation architecture using CloudFront, WAF, ALB, and API Gateway to route user traffic across two availability zones in us-east-1. Frontend EC2 instances serve web content while Aggregation API Servers orchestrate calls to CaseDetails and Existing API Services, with all traffic flowing through public subnets via WAF and CloudFront CDN. CloudWatch, X-Ray, and CloudTrail provide comprehensive observability and audit logging to S3, ensuring high availability, security, and operational visibility across the entire stack. Fork this diagram on Diagrams.so to customize subnets, instance types, or add additional backend services. The design demonstrates enterprise-grade API composition with defense-in-depth security and multi-layer tracing for troubleshooting distributed requests.