Multi-AZ mobile productivity app architecture on AWS with CloudFront CDN, WAF, and Application Load Balancers across us-east-1a and us-east-1b. Traffic flows through CloudFront to WAF-protected ALBs routing to microservices (Auth, Room, Alarm, Leaderboard, Payment via ECS and Lambda) in private subnets, backed by PostgreSQL RDS, DynamoDB, ElastiCache, and S3 with cross-AZ replication. This architecture delivers high availability, automatic failover, and sub-100ms latency for iOS/Android clients while integrating external APIs (Agora, Twilio, Razorpay) via secure service boundaries. Fork this diagram on Diagrams.so to customize subnets, add additional services, or adapt for your AWS region and workload. The standby ALB and database replicas ensure zero-downtime deployments and disaster recovery compliance.