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    Event-Driven Microservices

    Split a growing monolith along domain events, not folders. Each service owns a Postgres schema, publishes via the transactional outbox, and fans out on SQS/SNS. Redis stays for sessions, locks, and read models that need to be hot. No distributed transactions — sagas instead.

    5K – 300Kusers supported
    $300 – $2,800/month infrastructure

    Architecture Diagram

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

    BFFNext.jsAuth SvcCore SvcBilling SvcSNS / SQSEventsRedisLocks + cachePostgresPer serviceRead ModelFrontendAPIQueueCacheDatabaseBackend

    Use Cases

    SaaS where billing, auth, and core product need independent deploys
    Teams that ship weekly without locking one database
    Integrations that must not block the user request
    Read models for dashboards fed from events
    Strangling a monolith one bounded context at a time

    Technology Stack

    frontend

    Next.js BFF

    backend

    Node.jsLaravel servicesGo workers optional

    database

    PostgreSQL per serviceRedis

    infrastructure

    AWS SQS/SNSECSRDS

    Scalability Roadmap

    Stage 1Modular monolith users· One API + modules

    Start here. Module boundaries and outbox tables first.

    Stage 22–4 services users· SQS + Redis

    Extract the slowest or riskiest domain. Shared Redis only for cache.

    Stage 3Platform users· ECS + per-svc RDS

    Independent databases. Contract tests on events.

    Stage 4Many teams users· Mesh + cells

    Service mesh, cell-based deploy, platform team owns the bus.

    Cost Breakdown

    Development Cost

    $22,000 – $60,000 (12–24 weeks to extract well)

    Infrastructure Cost

    $300 – $2,800/month

    Maintenance Cost

    $2,500 – $7,000/month for contracts, tracing, and on-call

    Security Considerations

    Service-to-service mTLS or signed internal JWTs
    Each DB credential is unique — blast radius is one service
    PII events minimised; billing service is the only one with Stripe secrets

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    Scalable SaaS platform with per-tenant isolation and billing

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    Startup MVP Stack

    Launch-ready MVP in 6 weeks — modern, scalable, production-ready

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    Global Multi-Region SaaS

    Pin users to a region, keep Redis local, replicate the DB

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