Smerdoff
Smerdoff Technologies / Shopify

Shopify App Development Company for Custom E-Commerce

Most Shopify stores hit a wall the default theme and app marketplace can't fix — a checkout flow that needs custom logic, an inventory sync no public app handles correctly, a workflow that's specific to your business. We build custom private and public Shopify apps that extend the platform instead of fighting it.

ShopifyShopify APIApp StoreCheckout ExtensionsE-Commerce
10–30%
of a full build is what a lean first version costs on a modern stack — validate before you scale
MVP cost research
~3×
higher conversion for a 1-second site vs a 5-second one — the stack you build on decides this
Web design research

Why merchants bring in a dedicated Shopify app team

Theme customization and off-the-shelf apps only go so far. When the logic gets specific, you need code built for your store, not a generic plugin.

Private apps for internal logic

Custom pricing rules, order routing, or inventory sync that's specific to how your business actually operates — not bent to fit a generic app's settings.

Public app development

Building a Shopify app to list on the App Store, from scoping the feature set to handling review and approval.

Deep Shopify API experience

Admin API, Storefront API, and webhooks used correctly — not duct-taped scripts that break on the next platform update.

Checkout and theme extensions

Shopify Functions, checkout UI extensions, and theme app extensions built to Shopify's current architecture, not deprecated approaches.

Senior engineers, not a junior bench

The people scoping your app are the people building it — no handoff gap between sales and delivery.

Built to hand off

Documentation and clean commit history so your in-house team, or the next vendor, isn't stuck reverse-engineering decisions.

What a Shopify engagement typically includes

Scoped to what your store actually needs — not a fixed package of features you'll pay for and never use.

Custom private apps

Internal tools and workflows connected directly to your store's data via the Admin API.

Public app development

Apps built for the Shopify App Store, including submission and review support.

Third-party integrations

Connecting Shopify to your ERP, CRM, fulfillment, or accounting systems without brittle middleware.

Checkout & theme extensions

Custom checkout logic and storefront extensions using Shopify's current extension framework.

Migration to Shopify

Moving stores from other platforms with data, SEO, and integrations intact.

Ongoing maintenance

Keeping custom apps working through Shopify API and platform updates.

FAQ

Both. Some clients need a private app for internal workflows only their store uses; others want to publish on the Shopify App Store as a public app. We scope the engagement around which one fits.

Yes. Theme customization covers layout and design. When you need custom logic — pricing rules, inventory sync, checkout behavior — that requires app development against the Shopify API, which is where we come in.

It depends on scope — a focused private app for one workflow costs less than a public app with a broad feature set and ongoing App Store maintenance. We give a fixed estimate after a short scoping call rather than a generic range.

Yes. We build to Shopify's current app requirements from the start and support you through the submission and review process, including fixing any issues Shopify's reviewers flag.

Related

Get a free quote for your Shopify app

Tell us what your store needs — a private internal tool or a public App Store listing — and we'll scope an approach and a free quote.