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    E-CommerceAdvanced

    Inventory & OMS

    An inventory and order-management service that keeps available-to-promise honest across web, marketplaces, and warehouses. Redis atomic counters reserve stock for minutes; PostgreSQL commits the ledger. Oversell becomes a design bug, not a busy weekend.

    2K – 200Kusers supported
    $180 – $2,000/month infrastructure

    Architecture Diagram

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

    ChannelsWeb / AMZ / POSOMS APIATPRedis CountersAtomicStock LedgerPostgreSQLAlloc. RulesEngineWarehousesWMS / 3PLChannel SyncWorkersUserAPICacheDatabaseBackendExternalQueue

    Use Cases

    Retailers selling on site + Amazon + wholesale from one pool
    Safety stock and channel-specific allocation rules
    Warehouse transfers and in-transit inventory
    Preventing flash-sale oversell
    ATP (available to promise) for B2B order windows

    Technology Stack

    frontend

    React adminNext.js

    backend

    Node.jsBullMQ

    database

    PostgreSQLRedis

    infrastructure

    AWS ECSRDSElastiCache

    integrations

    Shopify / custom storefront3PLmarketplaces

    Scalability Roadmap

    Stage 11 warehouse users· RDS + Redis

    Single warehouse. Redis holds. Nightly reconcile with Postgres.

    Stage 23–5 warehouses users· Rule engine + workers

    Allocation rules. Channel sync workers. Marketplace rate-limit aware.

    Stage 3High SKU count users· Sharded counters

    Redis Cluster keyed by SKU. Postgres partitioned by warehouse.

    Stage 4Global users· Regional ATP + global ledger

    Local Redis ATP per region. Global Postgres ledger. Eventual sync with conflict policy.

    Cost Breakdown

    Development Cost

    $16,000 – $40,000 (8–16 weeks)

    Infrastructure Cost

    $180 – $2,000/month

    Maintenance Cost

    $1,500 – $4,000/month for channel quirks and peak-sale counter audits

    Security Considerations

    Reservations expire; only signed internal services can commit stock
    Marketplace credentials in a secrets manager, rotated
    Audit trail for every adjustment — no silent admin edits
    Reconciliation job alerts when Redis and Postgres drift

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