OpenShift cluster with Istio service mesh provides advanced traffic management, security, and observability for microservices running across frontend, backend, and database tiers. User requests flow through the Istio Ingress Gateway, which routes traffic via VirtualService rules and DestinationRule policies to frontend pods, which communicate with backend pods (with Envoy sidecars), which access database pods backed by persistent storage. This architecture demonstrates Kubernetes best practices including StatefulSet for stateful workloads, PersistentVolumeClaim for data durability, and Secrets for credential management. Platform engineers can fork this diagram to customize node pools, add additional services, or modify traffic policies for their specific resilience and performance requirements. The integration of Istio sidecars enables fine-grained traffic control, circuit breaking, and distributed tracing without application code changes.