GCP serverless B2B portal architecture combines Cloud Run, Cloud SQL, and Memorystore to deliver dual React frontends (company profile and dashboard) with a Python REST API backend and Wagtail headless CMS. Azure Entra ID provides enterprise SSO via OIDC/SAML, while Cloudflare handles DNS, WAF, and DDoS protection at the edge. GitLab CI/CD automates testing, security scanning, containerization, and deployment to Google Artifact Registry, enabling auto-scaling and pay-per-use cost optimization. Cloud Monitoring, Managed Prometheus, Grafana, and OpenTelemetry provide full observability across the application and data layers. Fork this diagram on Diagrams.so to customize for your B2B portal, adjust scaling policies, or swap authentication providers. This architecture demonstrates production-grade multi-cloud identity integration with serverless cost efficiency.