Multi-Cloud Architecture Patterns

Active-Active Regional Split

• Run customer-facing services in two providers for resiliency
• Use global DNS and traffic steering to shift load during incidents
• Keep shared data replicated asynchronously unless low-latency writes are mandatory

Best-of-Breed Service Mix

• Analytics and ML on GCP
• Enterprise identity and Microsoft workloads on Azure
• Broad ecosystem integrations on AWS
• Oracle-centric databases and regulated transaction systems on OCI

Primary / DR Pairing

• Keep primary infrastructure in the provider closest to operational expertise
• Use a second provider for cold or warm disaster recovery
• Validate RPO/RTO assumptions with regular failover exercises

Portable Platform Baseline

• Standardize on Kubernetes, Terraform/OpenTofu, PostgreSQL, Redis, and OpenTelemetry
• Abstract cloud differences behind modules, golden paths, and service catalogs
• Document provider-specific exceptions such as IAM, networking, and managed database behavior