Multi-AZ notification routing pipeline leveraging AWS WAF, ALB, and RDS with cross-region failover. Incoming notifications flow through WAF and Application Load Balancer into an Ingestion Layer that parses and normalizes events across two availability zones. The Rule Engine evaluates routing rules and applies actions (block, delay, upgrade) while logging to DynamoDB and persisting state to RDS Primary with standby replication. Delivery Scheduler uses SQS queues to trigger ECS-based Client Dashboard services, with CloudWatch monitoring the entire pipeline for operational visibility. This architecture demonstrates high-availability patterns essential for mission-critical notification systems requiring sub-second latency and zero data loss. Fork this diagram on Diagrams.so to customize subnets, add SNS topics, or integrate additional delivery channels like SMS or email. Consider adding cross-region replication for RDS and DynamoDB if global failover is required.