Multi-AZ blood donation platform on AWS with CloudFront CDN, AWS WAF, and Route 53 routing traffic across two availability zones for high availability. Application tier spans EC2, ECS microservices (Donor, Admin, Recipient), and Lambda functions (Search, Request handlers) in private subnets behind ALBs. Data layer uses RDS Primary/Standby replicas, DynamoDB Global Tables, and ElastiCache for sessions, ensuring zero-downtime failover and disaster recovery. This architecture demonstrates AWS best practices for healthcare compliance, multi-region resilience, and cost-optimized compute scaling. Fork and customize this diagram on Diagrams.so to adapt subnet ranges, instance types, or add additional services like S3 for document storage or Kinesis for real-time analytics.