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    Global Multi-Region SaaS

    A SaaS topology for global customers: tenant → home region mapping, local Redis for sessions and cache, Aurora Global (or regional DBs) for data, and a control plane that never puts EU customer cache in us-east-1. Latency and residency are product features, not afterthoughts.

    10K – 500Kusers supported
    $800 – $6,000/month infrastructure

    Architecture Diagram

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

    Tenant UserTenant RouterEdgeControl PlaneGlobalApp Region AApp Region BAurora GlobalRedis ARedis BUserAPIBackendDatabaseCache

    Use Cases

    B2B SaaS selling in US and EU with GDPR residency
    Products where p95 API latency must stay under 150ms worldwide
    Enterprise tenants that demand a named region
    Disaster recovery with a warm second region
    Marketplace-style SaaS with regional payment entities

    Technology Stack

    frontend

    Next.jsregional origins

    backend

    Laravel / Node.jstenant router

    database

    Aurora Global PostgreSQLRedis per region

    infrastructure

    Route 53ECS per regionTerraform

    integrations

    Stripe regional accountsSSO

    Scalability Roadmap

    Stage 1One region users· Multi-AZ

    Ship one region well. Store tenant.region from day one.

    Stage 2Second region reads users· Replica + local Redis

    EU reads locally. Writes still primary until volume justifies more.

    Stage 3Home-region writes users· Regional DBs or Aurora Global

    Tenants pinned. Cross-region only for the control plane.

    Stage 4Many regions users· Cell-based architecture

    Independent cells. Blast radius is one cell, not the planet.

    Cost Breakdown

    Development Cost

    $28,000 – $75,000 (14–26 weeks)

    Infrastructure Cost

    $800 – $6,000/month

    Maintenance Cost

    $3,000 – $8,000/month for routing, lag, and residency audits

    Security Considerations

    Tenant region is enforced in middleware and in Postgres RLS
    Redis never used as a cross-region PII dump
    Control plane access is break-glass and logged
    DPA-ready: you can point to where a tenant’s data lives

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