Multi-AZ social media platform leveraging CloudFront CDN, Route 53 DNS, WAF, and Cognito for global delivery and authentication across two availability zones. Traffic flows through ALB to containerized microservices (ECS) and serverless functions (Lambda) in private subnets, with RDS Primary/Standby, DynamoDB, ElastiCache, and OpenSearch replicated across AZ-1 and AZ-2 for resilience. This architecture demonstrates AWS best practices for fault tolerance, auto-scaling, and separation of concerns using VPC subnets, SQS event queues, and SNS notifications. Fork and customize this diagram on Diagrams.so to adapt service topology, add additional regions, or modify database tier configurations. The design supports millions of concurrent users by isolating presentation, application, and data layers while maintaining sub-millisecond session lookups via Redis and full-text search via OpenSearch.