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    E-Commerce Order Orchestration

    The order brain behind a serious store: a saga/state-machine that coordinates payment capture, stock commit, fraud review, warehouse allocation, shipping, and returns. Redis holds in-flight reservations and saga state; PostgreSQL is the durable order ledger. Designed so a failed payment or warehouse timeout never leaves the system half-updated.

    5K – 1Musers supported
    $400 – $4,000/month infrastructure

    Architecture Diagram

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

    CheckoutOrder APIIdempotentOrch. EngineSaga / TemporalRedisReservationsOrder LedgerPostgreSQLPaymentsStripeWarehouse3PL / WMSDLQ + OpsSQSUserAPIBackendCacheDatabaseExternalQueue

    Use Cases

    Brands selling across web, marketplace, and wholesale with one order pipe
    Split shipments and multi-warehouse allocation
    Pre-order and backorder flows with promised dates
    Returns, refunds, and partial captures without spreadsheet ops
    Peak events (BFCM) where checkout must stay consistent under load

    Technology Stack

    frontend

    Next.js adminReact

    backend

    Node.jsTemporal / custom sagaBullMQ

    database

    PostgreSQLRedis Streams

    infrastructure

    ECSRDSElastiCacheSQS

    integrations

    Stripewarehouses / 3PL APIstax engines

    Scalability Roadmap

    Stage 10 – 5K orders/mo users· Single API + Redis + RDS

    In-process saga with Redis locks. Fine until a 3PL timeout becomes common.

    Stage 25K – 50K users· Workers + SQS

    Each step is a worker. SQS between steps. Postgres outbox for events.

    Stage 350K – 300K users· Temporal / dedicated orch.

    Durable workflows, timeouts, and human-in-the-loop review queues.

    Stage 4300K+ users· Multi-region ledger + local Redis

    Order writes in the home region. Redis reservations local to the selling region. Cross-region only for the ledger.

    Cost Breakdown

    Development Cost

    $30,000 – $80,000 (14–26 weeks)

    Infrastructure Cost

    $400 – $4,000/month

    Maintenance Cost

    $3,000 – $9,000/month for 3PL quirks, peak runbooks, and refund edge cases

    Security Considerations

    Idempotency keys stored in Redis + Postgres so webhooks cannot double-capture
    Compensation steps are explicit — no silent stock or money drift
    PII in the ledger is encrypted; warehouse payloads are minimised
    Ops replay requires role + audit log; no raw SQL against live orders

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