Before you hire a custom Shopify app developer, ask them eight things: whether they will tell you when an existing app is enough, how they learn how your store actually runs, what the smallest first version would be, whether it will be a private app or use Shopify Plus extensions, how it will handle your volume, what happens when something fails, how they build and test it, and who maintains the app after launch. A developer who answers these clearly is far less likely to leave you with another app that almost does what you need.
This guide is for Shopify and Shopify Plus merchants whose operations need logic no off-the-shelf app provides: inventory that drifts between stores and warehouses, orders routed by hand, returns rules too specific for a standard returns app, or weekly CSV exports to reconcile what Shopify shows. If you are still deciding what kind of partner you need, start with Shopify Plus agency vs custom Shopify app developer: which do you need?
1. Will they tell you when an existing app is enough?
A custom app is software your business depends on every day, so it should solve a problem the Shopify App Store cannot. Ask whether they will review the apps you already use and tell you when one of them, or a different one, covers the workflow. Be wary of a developer who proposes a custom build before looking. See When Shopify App Store apps aren't enough: build vs buy.
2. How will they learn how your store actually runs?
Ask how they will map the way orders, stock and returns move through your business before designing anything. A good developer starts with your workflow, not with a feature list, and can describe it back to you in your own terms.
3. What is the smallest first version?
Ask them to scope the smallest app that removes the most manual work, rather than everything at once. You should see working software early and decide what comes next from there.
4. Private app, extensions, or both?
Ask what form the app will take and why: a private app built for your store, admin extensions your team uses inside Shopify, or checkout UI extensions on Shopify Plus. The answer should follow from what the app needs to do, not from what the developer usually builds.
5. How will it handle your volume?
An app that works on a test store can struggle with a real catalog. Ask how it will behave with your number of products, stores, locations and orders, and how stock and order changes will stay consistent across them. For inventory, see How to sync Shopify inventory across multiple stores and warehouses; for orders, see Routing Shopify orders across warehouses, suppliers, and drop-ship partners.
6. What happens when something fails?
Ask how the app will log errors, retry, and alert someone when a sync or an order route fails. The goal is a failure caught and fixed, not one discovered later by a customer or a stock count. See Why automations fail silently and create duplicate records.
7. How do they build and test it?
Ask whether the app is built and tested in increments against your real edge cases, such as split orders, returns and exchanges, and supplier feeds, rather than delivered all at once at the end.
8. Who maintains the app after launch?
Shopify changes, and so does your store. Ask who will monitor, maintain and extend the app as you grow, and make sure you own the code, the accounts and the documentation.
Running on apps that almost do what you need? Bring it to a Systems Discovery Call and we will map the right build, whether you hire us or not.
Red flags
- A custom build proposed before your current apps and workflow are reviewed.
- No clear first version, only a long feature list.
- No answer on how the app handles your catalog size and order volume.
- No logs, retries or alerts, so failures surface only when someone notices.
- The app delivered all at once instead of built and tested in increments.
- No one named to maintain it after launch.
How we work
We start with a 45-minute discovery call on how your store actually runs today, then map the workflow and scope the smallest high-impact app. We build working software in increments, so you see progress early, and we maintain and extend the app long-term as your store grows. We build custom and private apps for inventory sync, order routing, returns and exchanges, AI product recommendations, and ops dashboards and reporting, plus admin extensions and checkout UI extensions for Shopify Plus stores. Our Shopify work for Midway Sports runs across 200,000+ SKUs. Details are on our custom Shopify app development page.
Common questions
When does a Shopify store need a custom app?
When its operations need logic no off-the-shelf app provides: for example inventory sync across stores, order routing to warehouses or suppliers, returns rules too specific for a standard returns app, or weekly CSV exports to reconcile what Shopify shows.
What should the first conversation with a Shopify app developer cover?
How your store runs today, which apps you already use, and where work is still done by hand. A good developer leaves you with a clear idea of what to build first, or tells you that you do not need a custom app.
Who maintains a custom Shopify app after launch?
Agree this before you hire. We maintain and extend the apps we build long-term as your store grows.
Next step
If your store stacks several apps to cover one workflow, or your team still fixes stock and orders by hand, book a Systems Discovery Call. It is 45 minutes on how your store runs today, and you leave with a clear plan for what to build first, whether you hire us or not.
Farooq Ch
Nov 2026