Multi-environment MongoDB Atlas to GKE connectivity using GCP Private Service Connect (PSC) isolates database traffic across dev, UAT, and production workloads. Three MongoDB Atlas M10 replica set clusters in us-central1 expose PSC Service Attachments that route through PSC Forwarding Rules and Endpoints into isolated GCP Runtime VPCs (quantax-dev-vpc, quantax-uat-vpc, quantax-prod-vpc), eliminating public internet exposure. GKE clusters running EP3 workloads consume these private endpoints at fixed IPs (10.10.1.5, 10.20.1.5, 10.30.1.5) for secure, low-latency database access. This architecture enforces network segmentation and least-privilege access while maintaining Atlas-managed infrastructure, reducing operational overhead and blast radius per environment. Fork this diagram on Diagrams.so to customize VPC CIDR ranges, add firewall rules, or extend to additional regions and clusters.