Multi-tier React app architecture on GCP combining Cloud CDN, Cloud Load Balancer, and Cloud Armor for frontend delivery with API Gateway routing to Cloud Functions and Cloud Run backends. Data layer spans Cloud SQL, Firestore, and Memorystore across isolated private subnets, while Secret Manager and Identity Platform secure authentication and secrets. This pattern demonstrates GCP best practices for separation of concerns, network isolation, and serverless scalability ideal for production SaaS platforms. Fork and customize this diagram on Diagrams.so to match your VPC topology, add additional Cloud Functions, or swap Cloud Run for GKE.