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    Multi-Region Database

    A multi-region data plane: one write region, Aurora Global Database replicas for local reads, Redis Cluster per region for sessions and cache, and a health-checked failover runbook. Built for products that cannot afford a 200ms ocean hop or a single-AZ outage.

    10K – 1M+users supported
    $600 – $8,000/month infrastructure

    Architecture Diagram

    Interactive — hover over any node to see its role and description.

    Global UserLatency DNSRoute 53API USPrimary writesAPI EULocal readsAurora GlobalWriter + replicasRedis USRedis EUFailover Orch.RunbookUserExternalAPIDatabaseCacheBackend

    Use Cases

    SaaS with customers in US, EU, and APAC who feel latency
    Data-residency requirements (EU reads stay in eu-west-1)
    Active-passive DR with RPO measured in seconds
    Global storefronts that must keep checkout available during a region loss
    Read-heavy analytics close to each market

    Technology Stack

    frontend

    Next.jsCloudFront / regional origins

    backend

    Node.jsLaravelgRPC internals

    database

    Aurora PostgreSQL GlobalRedis Global Datastore

    infrastructure

    Route 53 latency routingAWS Global AcceleratorTerraform

    Scalability Roadmap

    Stage 1Single region users· Multi-AZ RDS

    Start with Multi-AZ in one region. Measure real latency before adding a second region.

    Stage 2Two regions users· Aurora replica + regional Redis

    Read replica in the second region. App is read-local, write-primary. Redis per region.

    Stage 3Three+ regions users· Aurora Global + write forwarding

    Aurora Global Database. Optional write forwarding for low-volume mutations from far regions.

    Stage 4Active-active users· Cockroach / Spanner / sharded

    Only when a single writer is the bottleneck. Conflict rules, idempotency keys, and higher cost.

    Cost Breakdown

    Development Cost

    $25,000 – $70,000 (12–24 weeks including DR drills)

    Infrastructure Cost

    $600 – $8,000/month (cross-region replica IO is the surprise bill)

    Maintenance Cost

    $3,000 – $8,000/month for failover tests, lag monitoring, and capacity

    Security Considerations

    Encryption in transit on every cross-region replication link
    Region-aware data residency: EU PII never cached in US Redis
    Failover credentials in a separate account; break-glass audited
    IAM scoped so a compromised regional app cannot DROP the global cluster

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    Sliding windows, API keys, and sticky sessions on Redis

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