Multi-AZ cognitive health risk assessment platform on AWS with WAF, CloudFront, and API Gateway protecting a microservices backend across ECS, Lambda, and EC2 compute tiers. User requests flow through Cognito authentication to an Application Load Balancer distributing traffic to Authentication Service, Cognitive Test Service, and Behavioral Data Service, all feeding a Risk Engine that queries RDS Primary, DynamoDB, and ElastiCache across two availability zones. High-availability architecture with cross-AZ replication ensures zero data loss and continuous availability for real-time risk scoring in clinical workflows. Fork this diagram to customize subnets, instance types, or add additional services like SageMaker for predictive modeling. The design demonstrates defense-in-depth security with WAF, KMS encryption, Secrets Manager, and CloudTrail audit logging for regulated healthcare environments.