SHOPIFY INVENTORY SYNC

Real-time Shopify inventory sync across stores, warehouses, and suppliers.

For brands running more than one Shopify store, warehouse, or supplier feed, where stock levels drift apart and someone fixes them by hand. We build custom sync apps and middleware that keep one source of truth for inventory and push it everywhere it needs to be.

One inventory source across every store and location
Real-time product and variant sync through the Shopify Admin API
Out-of-stock detection and replacement matching

Real-time sync across 5 stores · 10+ years in production

5 stores

Synced in real time

200,000+

SKUs on a system we built

////WE’VETRUSTED BY

SOUND FAMILIAR?

Your stock numbers do not agree with each other.

Each Shopify store shows a different count for the same product.
You oversell because a warehouse or supplier update arrived late.
Someone exports and re-imports spreadsheets to fix stock levels.
Out-of-stock items stay live until a customer complains.
Inventory apps from the App Store cannot handle your store or location setup.
Vendors and suppliers each send stock in their own format.

WHY CHOOSE STACKWORX

We have shipped real-time inventory sync

Midway Inventory runs real-time Shopify inventory sync we built, and Fantasy Middleware keeps inventory in sync across 5 stores in real time. We bring that experience to your stores.

One owner for every number

We agree up front which system owns stock for each location, so syncs never fight each other.

Built for your setup

Multiple stores, warehouses, and supplier feeds handled the way your operation works, not the way a generic app assumes.

Long-term ownership

We stay on to maintain the sync as Shopify's APIs, your catalog, and your stores change.

WHAT WE BUILD

Inventory sync built around how your stock actually moves

01Core

Multi-store inventory sync

One inventory source pushed to every Shopify store in real time, so the same product shows the same stock everywhere.

Shopify Admin API
Real-time
Multi-store

Warehouse and location stock

Inventory organized by exact warehouse location, feeding the counts each store and channel sells from.

Supplier and vendor feeds

Vendor workflows and API connections that turn supplier stock updates into accurate Shopify inventory.

Out-of-stock handling

Automated out-of-stock detection and replacement matching, so sold-out items are handled before customers find them.

Central portal

A single portal for inventory, products, vendors, and combined orders across stores.

Monitoring and ownership

Sync errors surface instead of failing silently, and we maintain the app long-term.

18.5M+
Transactions in production
200,000+
SKUs managed
5 stores
Synced in real time
10+ yrs
In production

Proof · Midway Inventory

A Rails inventory system synced with Shopify in real time.

For Midway Sports we built a Rails-based inventory system integrated with Shopify's Admin API. It handles real-time product and variant sync, out-of-stock detection, and automated replacement matching across multiple sales channels from one unified inventory source. Midway's order and inventory system manages 200,000+ SKUs. For Fantasy Middleware we built real-time inventory sync across 5 stores, with a centralized portal, API connections, product sync, vendor workflows, and combined orders.

Book a Discovery Call

Midway inventory system with real-time Shopify sync

HOW IT WORKS

From drifting stock counts to one source of truth.

01
Discovery call
A 45-minute call on your stores, locations, suppliers, and where stock goes wrong today.
02
Map the stock flow
We decide which system owns each number and how updates move between stores, warehouses, and suppliers.
03
Build and test the sync
A custom app or middleware built against the Shopify Admin API and tested against your real catalog.
04
Monitor and own it
Errors are logged and alerted, and we maintain the sync as your catalog and store setup change.

WHAT CLIENTS SAY

Partners, not vendors

Farooq did an excellent job with our Shopify inventory sync integration. He clearly understands Shopify app integrations and implemented real-time stock synchronization smoothly and efficiently. Communication was clear, deadlines were met, and everything works perfectly. Highly recommended!

elena_nevex

Fiverr client, United States

Verified on Upwork

FAQS

Before You Get Started

What does Stackworx do?

We build and take ownership of the systems your business runs on: custom Shopify apps, Ruby on Rails platforms, third-party integrations, and practical AI workflows. Most clients come to us when off-the-shelf apps and quick fixes stop scaling.

Do you only build new products, or can you take over an existing system?

Both. A large part of our work is taking over existing Rails and Shopify codebases, stabilizing them, and then extending them. We start with a technical audit so you know exactly what you have before anything changes.

How do you add AI to a business that already has software?

We add AI inside the systems you already run rather than bolting on a separate tool. Typical work includes content generation, document and data extraction, product recommendations, and support automation, shipped as a focused AI Integration Sprint with measurable outcomes.

How do engagements usually start?

Most clients start with a Technical Audit or an AI Integration Sprint. From there we move to an MVP build or a dedicated product team on a monthly retainer, depending on how much ongoing work you have.

Which industries do you work with?

Mostly ecommerce brands on Shopify and SaaS companies in PropTech, InsurTech, and FinTech. Our platforms have processed 32M+ transactions and serve 20,000+ real estate agents.

Where is your team, and how do you work with US clients?

Our senior engineering team is based in Lahore, Pakistan, and we contract with US clients through Stackworx LLC, our Wyoming company. We work across time zones with regular overlap hours, async updates, and long-term ownership of the systems we build.

Stock counts drifting between stores? Let's map the fix.

Book a 45-minute Systems Discovery Call. You leave with a clear plan for how your inventory should sync, whether you hire us or not.