Shopify backend
that actually works.
Order sync, inventory accuracy, fulfillment automation, and WMS integrations for Shopify and WooCommerce — built by people who understand what happens after the customer clicks Buy, not just before.
How eCommerce backends actually break
Shopify marked it fulfilled. Your WMS never saw the order.
The webhook fires on order creation. Shopify logs it as delivered. Your WMS received nothing. No error, no alert — just a customer waiting and an ops team that found out three hours later when someone noticed the order wasn't in the pick queue. This is what happens when a webhook integration has no delivery confirmation and no retry logic.
Shopify says 82 units. Your WMS says 71. Your shelf has 68.
Inventory syncs on a 15-minute schedule. Fulfillment happens between sync cycles. Returns get processed in the WMS but the Shopify update fails silently. Oversells accumulate. By the time someone notices, there are three different numbers across three systems and a backlog of manual corrections to work through.
Every return is a manual 4-step process across three systems.
Return comes through Shopify. Someone manually creates a receipt in the WMS. Another person updates inventory. Someone else issues a refund or store credit. If anything is missed, the inventory is wrong, the refund is delayed, and the customer is following up. Returns are the most neglected workflow in eCommerce fulfillment — and the most expensive when they break.
What we work with
Not documentation-level familiarity. Production experience — real stores, real WMS instances, real failures we've debugged.
Shopify & Shopify Plus
Order webhooks, inventory sync, fulfillment confirmations, metafields, custom apps, Shopify Flow logic, shipping scripts, and Shopify Plus-specific features like B2B catalogs and multi-location inventory.
- Order webhook delivery & retry
- Real-time inventory push
- Fulfillment confirmation callbacks
- Custom Shopify apps & logic
- Shopify Plus B2B & wholesale
- Shipping rate customization
WooCommerce
Custom plugin development, REST API integrations, order status automation, inventory webhooks, shipping method logic, and WMS connections — without rebuilding your existing store.
- WooCommerce REST API integrations
- Custom order automation plugins
- Inventory sync hooks
- Shipping logic customization
- WMS order push configuration
- Payment & refund handling
WMS & Fulfillment Systems
Deep platform expertise in Infoplus and Extensiv — the most common WMS systems in 3PL operations. We know how these systems receive orders, process shipments, and push inventory updates back to storefronts.
- Infoplus order intake & fulfillment
- Extensiv 3PL WMS connections
- Logiwa & ShipHero support
- Shipment close → tracking push
- WMS inventory → storefront sync
- Multi-warehouse routing
ERP & Carrier Systems
Connecting order and inventory data between eCommerce storefronts and ERP systems, plus carrier APIs for rate shopping, label generation, and tracking event callbacks.
- NetSuite / QuickBooks sync
- Carrier rate shopping APIs
- Label generation automation
- Tracking event → storefront update
- Multi-carrier shipping logic
- Returns & RMA processing
Backend services, not storefront work
Everything here is about what happens after the order is placed — not how the store looks.
Shopify to WMS Integration
Orders from Shopify delivered reliably into your WMS — with confirmation, retry logic, duplicate detection, and failure alerting. Tracking numbers pushed back to Shopify automatically when the shipment closes.
- Webhook delivery confirmation
- Retry queue & deduplication
- Real-time tracking push
- Failure monitoring & alerts
WooCommerce to WMS Integration
Custom WooCommerce integration with your WMS via REST API. Order creation triggers, status updates, inventory callbacks, and shipment confirmations — built as reliable server-side logic, not a fragile plugin chain.
- REST API order push
- WMS status → WooCommerce sync
- Inventory accuracy layer
- Shipment close callback
Inventory Sync Optimization
Real-time or near-real-time inventory sync from your WMS to Shopify and other sales channels. Event-driven updates instead of scheduled polls so inventory reflects what's actually available — including multi-warehouse allocation.
- Event-driven inventory push
- Multi-location inventory sync
- Oversell prevention logic
- Conflict resolution rules
Order Flow Automation
Logic beyond what Shopify Flow or WooCommerce hooks can handle natively. Custom order routing, priority tagging, SLA assignment, fraud flag handling, hold logic — built as server-side automation that runs reliably at order creation.
- Custom routing & tagging
- SLA and priority assignment
- Hold and exception logic
- Multi-channel order normalization
Shipping Logic & Rate Configuration
Carrier selection rules, zone-based rate logic, dimensional weight calculations, and shipping method mapping between your storefront and WMS. Rate shopping connected to what the WMS actually prints on the label.
- Carrier selection rules
- Shopify shipping scripts
- WMS rate shop alignment
- Dimensional weight logic
Returns & Reverse Logistics
Automated return flows from Shopify or WooCommerce into your WMS — RMA creation, receipt triggers, inventory restock, and refund or store credit issuance. Returns handled in the system, not on a spreadsheet.
- RMA auto-creation
- WMS receipt trigger on return
- Inventory restock automation
- Refund / store credit logic
Replace Apps with Custom Logic
Too many Shopify apps chained together creates fragility, cost, and data latency. We replace multi-app dependency stacks with single, reliable custom integrations that do exactly what you need and nothing else.
- App dependency audit
- Custom logic replacement
- Reduced latency & cost
- Single point of maintenance
Webhook Troubleshooting & Optimization
Shopify webhooks fail silently. We diagnose broken webhook flows, implement delivery verification, build retry queues, and add monitoring so you know immediately when a webhook delivery fails — not when a client notices.
- Silent failure diagnosis
- Delivery confirmation layer
- Exponential retry queue
- Real-time failure alerting
What reliable fulfillment
operations actually look like
These aren't projections from a pitch deck. They're outcomes from fixing real eCommerce backends — operations that were leaking time and money through broken integrations and manual processes.
Audit your backendEvent-driven order push vs. 15-minute polling. Orders hit the pick queue before the customer finishes checkout.
After replacing scheduled batch sync with real-time event-driven inventory updates across all channels.
End-to-end automation: order in Shopify → WMS pick/pack/ship → tracking pushed back to Shopify. No human touchpoints.
After fixing fulfillment visibility — customers get accurate tracking updates automatically instead of emailing support.
Audit first.
Fix the root cause.
Audit the current flow end to end
We map what happens from the moment an order is placed in Shopify to when a tracking number lands with the customer — and everywhere data moves between your storefront, WMS, ERP, and carriers. Failures and gaps are usually visible in the first hour.
Fix the broken connections — not with more apps
Most eCommerce operations are over-appified. Every broken flow has an app that 'solves it.' Those apps break at volume, conflict with each other, and add latency. We fix the underlying integration with proper server-side logic.
Automate the manual steps
We identify every click your ops team makes that a system event should make instead — order tagging, routing decisions, inventory adjustments, return processing, tracking updates. Then we automate them.
Monitor and respond
Every integration we build includes monitoring. Webhook delivery failures, inventory sync errors, order processing exceptions — you find out when they happen, not when a customer complains.
We don't build storefronts.
We fix fulfillment.
Most Shopify developers know themes, apps, and the storefront. We know what happens after the order is placed — where data goes, where it breaks, and how to make it reliable at the operational level.
Operations expertise, not just code
We understand 3PL workflows, WMS order flows, and fulfillment SLAs. When we build a Shopify ↔ WMS integration, we know what a pick queue needs to receive and what the tracking callback has to include.
We replace apps, not add them
Your current broken flow probably already has 4 apps 'handling' it. We remove the dependency stack and replace it with a single reliable integration. Fewer moving parts, lower cost, no latency chains.
Built for volume, not demos
Integrations that work at 10 orders/day often break at 500. We build with rate limits, retry queues, idempotency, and load in mind. Black Friday is not when you want to discover your webhook handler doesn't scale.
Direct access, fast response
When an order stops syncing on a Tuesday afternoon, you don't want a support ticket. You want someone who knows your setup and can diagnose it in minutes. That's what we provide.
Common questions
Do you do Shopify theme or storefront design work?
No. We focus entirely on backend operations — integrations, order flow automation, inventory sync, fulfillment logic, and API development. If you need storefront design or theme work, that's a different specialty.
What WMS systems do you integrate with Shopify?
Our deepest WMS expertise is Infoplus and Extensiv (3PL Central / 3PL Warehouse Manager). We also work with Logiwa, ShipHero, and other WMS systems that expose an API. The Shopify side is standard across all of them.
Can you replace our existing Shopify app stack with custom integrations?
Yes — and this is often one of the highest-ROI projects we do. A chain of 4–5 apps handling order routing, inventory sync, and fulfillment updates introduces latency, cost, and fragility. A single custom integration replacing them is faster, cheaper to operate, and far more reliable.
Do you work with Shopify Plus?
Yes. Shopify Plus gives access to features that standard Shopify doesn't — checkout extensibility, Shopify Functions, B2B catalogs, multi-location inventory, and the organization admin. We've worked with these APIs and build to Plus capabilities when relevant.
How long does a Shopify to WMS integration take?
A standard Shopify → WMS order sync with tracking callback takes 1–2 weeks from scoping to tested production launch. Adding inventory sync is typically another 3–5 days. Returns automation is usually 1 additional week.
Can you fix an existing integration that's partially broken?
Yes. We start with an audit — what's failing, how often, and what the root cause is. Most broken Shopify integrations have the same three failure modes: no webhook retry, no delivery confirmation, and no monitoring. We fix all three.
Let's talk about your Extensiv setup
Tell us what you're running and where the pain is. We'll respond within 30 minutes.