MediLink's multi-AZ AWS architecture spans eu-west-1 with Route 53 and Global Accelerator routing global and mobile users through CloudFront CDN, AWS WAF, and Shield to dual ALBs across AZ-1 and AZ-2. Application tier runs EC2 t3.large instances, ECS Fargate for consultations and EHR services, and Lambda functions for patient analytics and event processing, all backed by RDS Primary/Standby, Aurora Primary/Replica, DynamoDB Global Tables, and ElastiCache replicas for sub-millisecond latency. Security is enforced via IAM, KMS encryption, GuardDuty threat detection, and Secrets Manager, while CloudWatch and CloudTrail provide observability and compliance audit trails. This architecture demonstrates high-availability healthcare workload design with 35TB EHR data in S3, Glacier archival, and AWS Backup for disaster recovery. Fork and customize this diagram on Diagrams.so to adapt the topology for your own multi-region or hybrid healthcare deployments.