Private GKE cluster ep3-quantax-dev in GCP runs a multi-node topology with segregated node pools for API gateways and Redpanda brokers, secured by Cloud NAT egress-only networking and a private control plane. Traffic flows through NGINX Gateway Fabric ingress to Kilkenny API and Admin gateways, with ClusterIP services routing to Redpanda Broker 1 and external MongoDB Atlas via Private Service Connect. This architecture demonstrates GCP best practices for zero-public-IP Kubernetes deployments with hard taints enforcing workload isolation and cost-optimized single-zone HA in development environments. Fork and customize this topology on Diagrams.so to adapt node machine types, CIDR ranges, or add multi-zone resilience for production. The 50 GB pd-standard boot disks and n2-standard-4 instances reflect typical dev-tier resource allocation at ~$603/month.