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Custom Shopify Apps & Checkout Functions

Shopify App Development Built Around The Logic No App Store Listing Can Handle

SkilledDesk builds custom Shopify apps — private apps wired into your store's own Admin API, embedded public apps built for App Store distribution, and checkout customizations rebuilt in Shopify's current Functions and Checkout UI Extensions model, not the checkout.liquid scripts Shopify already

retired.

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Checkout Function Executions
18,420
+34% MoM
Custom discount function calls, last 30 days
The Problem

What A Theme And An App Store Subscription Can't Cover

Checkout Customization That Broke When Shopify Retired The Old Model

Custom discount logic, shipping surcharges, or checkout upsells built through the old checkout.liquid template or Script Editor didn't survive Shopify's move to Checkout Extensibility — that functionality is gone outright until it's rebuilt in Shopify Functions and Checkout UI Extensions, a genuinely different programming model a theme edit can't touch.

Two Apps Racing To Write The Same Order Or Inventory Data

An inventory app and a wholesale-pricing app can both subscribe to the same webhook topic and fire their own update the moment an order comes in, with no guarantee which one runs last — the store ends up with whichever app happened to write second, not the correct combined result either app was actually built to produce.

Business Rules A Settings Toggle Was Never Built To Hold

Tiered wholesale pricing that changes by customer group and order volume, or fulfillment routing across more than one warehouse, is the kind of logic a generic App Store app only approximates with a fixed set of options — the moment the real rule falls outside those toggles, the app can't be configured around it, only worked around.

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Free Tool

How Solid Is Your Store's Technical Foundation, Right Now?

Before any custom app gets built on top of a store, the foundation underneath it needs to hold. Enter your store's URL for a free Store Tech Health Check covering HTTPS, mobile-friendliness, load speed, and search basics — the same gaps a custom app inherits if they're left unfixed.

Takes about 5 seconds — no signup needed to see the score.

What We Build

What We Actually Build For Shopify Brands

Custom Shopify App Development

Private apps wired directly into your store's Admin API for wholesale portals and ERP sync, embedded public apps built with App Bridge and Polaris, and checkout logic rebuilt in Shopify Functions — not a theme edit stretched past what Liquid can do.

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Social Media Marketing

Product and app-feature content built for the platform your store's actual customers already scroll, tied to attribution that survives whatever your custom checkout build changes about how a purchase gets tracked.

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Google Marketing

Shopping and Search campaigns wired to server-side conversion tracking, built to keep reporting accurate through a custom checkout rebuild instead of quietly losing purchase events the moment old Liquid-based tracking scripts stop running.

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The Numbers Behind Every Shopify App We Ship

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Brands Served
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Countries Reached
2019
Founded In Wyoming, USA
1:1
Direct Founder Access

What Does Shopify App Development Actually Cover?

Shopify app development means writing software that runs inside or alongside a store's own Admin API and checkout pipeline, not customizing a theme and not installing something ready-made from the App Store. A private app might sync inventory and order data with an existing ERP or run a wholesale pricing engine unique to one merchant; a public app is built for App Bridge and Polaris so it embeds inside the Shopify Admin the same way Shopify's own screens do, then goes through Shopify's own review before it can be listed. Since Shopify retired checkout.liquid and the Script Editor in favor of Checkout Extensibility, any checkout-level customization — a discount rule, a shipping surcharge, a post-purchase upsell — has to be written as a Shopify Function or a Checkout UI Extension, a genuinely different API surface from the Liquid templating most Shopify web design work is built around.

SkilledDesk builds exactly this layer for Shopify brands — private and public apps written against the current GraphQL Admin API (the REST Admin API is Shopify's own legacy surface at this point, not the one new apps get built against), plus the Functions and Extensions work checkout customization now requires. That's custom application development aimed at Shopify specifically, distinct from the Shopify web development work that focuses on a store's theme or product pages.

Why Not Just Install An App From The Shopify App Store Instead?

A ready-made app is genuinely the right call for anything close to a standard use case — reviews, basic email flows, a simple loyalty program. Where it stops working is the moment a business rule falls outside whatever settings toggles that app's developer chose to expose, and there's no way in past that UI to adjust the underlying logic itself. The usual workaround stacks another app on top — often a middleware layer that has to sit outside Shopify entirely, polling for webhook events and calling back into the store's API on its own schedule, adding a whole extra system that can lag, fail silently, or fall out of sync with what Shopify's own data actually shows. A Shopify Function runs natively inside Shopify's own checkout and discount pipeline instead — no external service watching for events, no polling delay, just the business rule executing exactly where Shopify already executes everything else. It's built once, owned outright, with the founder writing the integration code directly rather than handing the API work to a subcontractor, and real Shopify builds already open on the portfolio to check first.

A Shopify Build Already On The Portfolio, Not Manufactured For This Page

No custom Shopify app has its own named case study on the portfolio yet — a specific app build takes longer to result in a public, shareable number than a full store launch does, and that build hasn't landed yet. What's verifiable right now is the same 130+ brands across 14 countries and $10M+ in tracked client revenue since 2019 sitting behind every project here, plus a Shopify store build inside that history that closed its first month at $21K in sales — real, checkable Shopify platform work, even if it's a storefront result rather than an app-specific one.
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FAQ

Straight Answers To The Questions A Custom Shopify App Raises

The number moves with how much of the store's data your app actually touches and how it gets distributed, not catalog size. A private app for one store — syncing inventory to a single ERP, or running one custom pricing engine — typically runs $4,000-$12,000 depending on how many Admin API resources and webhooks it needs. A public, embeddable app built for App Store distribution, with its own Admin UI extensions and multi-store support, usually runs $15,000-$40,000+ once Shopify's own technical review requirements are factored in. Scope gets confirmed on the free call before anything is quoted.
A single-integration private app — one ERP connection, one pricing engine, one Function — typically takes 3-5 weeks. A multi-integration build or a public app runs 6-12 weeks for the development itself. If it's going to the App Store, add Shopify's own review cycle on top of that: their team audits the app against a specific technical and UX checklist and can come back with revision requests before approval, a timeline that sits with Shopify, not with us — we flag that possibility on day one rather than let it surprise you in week eight.
A redesign changes what the store looks like and how a product page or checkout flow presents to a shopper — that's theme and Liquid work, the same territory a Shopify web design project covers. An app changes what the store can actually do: syncing data with another system, running business logic no theme setting can hold, or customizing checkout beyond what Checkout UI Extensions expose out of the box. The two get built together often enough, but they're genuinely different disciplines — one changes the interface, the other changes the machinery underneath it.
Both, and the two are genuinely different projects. A private app is built and installed on one store only — no Shopify review, faster to ship, and it can use business logic specific to that one merchant. A public app has to work cleanly across different stores' data, meet Shopify's Built for Shopify technical and performance requirements, and pass Shopify's own review before it's listed — which one makes sense depends on whether the goal is solving one store's problem or eventually distributing the same solution to other merchants.
Yes, but not as a like-for-like copy — Script Editor and checkout.liquid don't exist anymore, so whatever logic used to live there gets rewritten as a Shopify Function (for discounts, shipping, and payment customization) or a Checkout UI Extension (for anything shown on the checkout page itself). The underlying business rule usually survives the rebuild fully intact; it's the code around it that has to change to Shopify's current model.
That's one of the most common private-app builds — a two-way sync that pulls stock levels and order status from your ERP or warehouse system into Shopify and pushes new orders back out, so nobody's re-entering the same data twice or trusting a number that's already gone stale by the time someone checks it. The exact integration points depend on what system you're already running, which gets mapped out before any code gets written.
Plenty of agencies that built up a name doing Shopify theme and Liquid work never picked up Shopify's current Functions and GraphQL Admin API model — so when a merchant's old checkout.liquid customization broke, that same shop often can't rebuild it in the model Shopify actually supports now. The founder handles the API and Functions work directly here, without handing the integration piece off to a subcontractor, with real Shopify builds already open on the portfolio before you commit to anything.

Ready To Build The Piece A Theme Or App Store Listing Can't?

Bring the business logic you actually need — a wholesale rule, an ERP sync, a checkout customization that broke — and leave the call with a real scope and quote, not a guess.

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