Multi-tier loyalty and CRM platform architecture featuring dedicated microservices for customer management, loyalty tracking, rewards processing, and analytics. Traffic flows from mobile, web, and admin users through CDN and WAF to an Application Load Balancer, then routes via API Gateway to five core services: Customer Portal (t3.medium), Loyalty Service (t3.medium), CRM Service (t3.medium), Rewards Engine (t3.large), and Analytics Service (t3.medium). Event-driven communication uses Message Queue and Event Bus to coordinate between services, while Redis Cache accelerates API responses and three separate RDS instances (Customer DB db.t3.large, Loyalty DB db.t3.medium, Analytics DB db.t3.medium) maintain data isolation. This architecture demonstrates best practices for scalable SaaS platforms requiring high availability, event-driven workflows, and separation of concerns across customer-facing and administrative functions. Fork this diagram on Diagrams.so to customize instance types, add auto-scaling groups, or integrate additional AWS services like Cognito for Auth/Identity or CloudWatch for enhanced monitoring.