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    E-CommerceAdvanced

    Headless Commerce

    Composable commerce: a Next.js (or native) experience layer, a commerce API for cart and checkout, a CMS for merchandising, and Redis at the edge of every read. Swap Shopify, a custom Postgres catalog, or both — the storefront never talks to the monolith theme.

    2K – 300Kusers supported
    $250 – $3,000/month infrastructure

    Architecture Diagram

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

    ShopperExperienceNext.jsMobile AppSame APIBFF / APINode.jsCMSSanity / StrapiCommerceAPI / ShopifyRedisPage + cartPostgreSQLUserFrontendAPIExternalBackendCacheDatabase

    Use Cases

    Brand sites that need marketing pages and a cart on the same domain
    Multi-brand / multi-storefront from one commerce backend
    App + web sharing the same cart and price lists
    Content-heavy lookbooks with live inventory
    Gradual escape from a coupled monolith theme

    Technology Stack

    frontend

    Next.jsReact Native optional

    backend

    Node.js commerce APIwebhooks

    database

    PostgreSQLRedis

    infrastructure

    VercelCloudFrontS3

    integrations

    Shopify / custom catalogSanity or StrapiStripe

    Scalability Roadmap

    Stage 10 – 5K users· Vercel + one commerce backend

    Next.js on Vercel. Shopify or a small Postgres catalog. Redis optional.

    Stage 25K – 50K users· BFF + Redis + ISR

    Dedicated BFF. Redis for composition cache. Webhooks revalidate ISR.

    Stage 350K – 200K users· Multi-storefront + CDN

    Several brands on one API. CloudFront. Read replicas for custom catalog.

    Stage 4200K+ users· Regional BFF + Redis

    BFF and Redis per region. Checkout still pinned to the commerce write region.

    Cost Breakdown

    Development Cost

    $20,000 – $55,000 (10–20 weeks)

    Infrastructure Cost

    $250 – $3,000/month plus CMS and commerce SaaS fees

    Maintenance Cost

    $2,000 – $6,000/month for merchandising schema and peak cache strategy

    Security Considerations

    Storefront tokens are publishable only — Admin APIs stay server-side
    Webhook signatures verified before ISR revalidation
    Price and discount logic never trusted from the client
    CMS roles separated from commerce finance roles

    More Architectures

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    E-Commerce Order Orchestration

    Payments, inventory, fulfillment, and returns as one state machine

    E-Commerce

    Inventory & OMS

    Real-time stock, reservations, and multi-warehouse allocation

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