Multi-AZ e-commerce backend spanning two AWS availability zones with WAF, CloudFront CDN, and ALB routing traffic to modular microservices. API Gateway distributes requests across Auth, Products, Orders, Payments, Chatbot, and Recommendation modules deployed in private subnets across AZ-1 and AZ-2. MongoDB Primary/Replica and Redis Cache/Replica provide data persistence and caching with automatic failover, while Event Bus decouples Orders and Payments processing. External integrations include Stripe for payments, OpenAI for chatbot intelligence, and a recommendation engine, with S3 for object storage and CloudWatch for monitoring and logging. Fork this diagram to customize subnets, add Auto Scaling Groups, or adjust module placement for your e-commerce workload.