Custom Shopify App Development
We design, build, and ship Shopify apps end to end — checkout UI extensions, embedded admin apps, Shopify Functions, and private integrations. We are the team behind SymTek Safe, a live app on the Shopify App Store.
Shopify app developers who ship production apps
SymTek is a Shopify app developer that builds the apps other teams outsource. Whether you need a private Shopify app for a single store or a public listing on the App Store, we handle the full stack — checkout extension development, embedded admin UIs, Shopify Functions, and Shopify API integration. We build on Next.js and React Server Components, the same model as Shopify Hydrogen. Houston-based, we work with merchants, brands, and agencies nationwide.
Shopify apps we build
From checkout extensions to full App Store listings.
Public App Store Apps
Full public apps built to Shopify's requirements — OAuth, GDPR webhooks, billing, and the App Store review. We take a listing from idea to approved and live.
Private & Custom Apps
A private Shopify app built for one store, doing exactly what your operation needs. No public listing, no review queue — installed directly and owned by you.
Checkout UI Extensions
As checkout extension developers, we add opt-in offers, custom fields, validation, and trust content to the checkout and Thank You pages on Shopify Plus — no liquid hacks, fully upgrade-safe.
Embedded Admin Apps
Merchant-facing tools built with Polaris and App Bridge that live inside the Shopify admin. Dashboards, bulk actions, and settings that feel native because they follow Shopify's own design system.
Shopify Functions
As Shopify Functions developers, we write the discount, delivery, payment, and cart-validation logic that runs on Shopify's backend — fast, server-side rules with no external app latency.
API Integrations, Billing & Webhooks
Shopify API integration with ERPs, 3PLs, ledgers, and third-party services through the Admin and Storefront APIs. We handle usage-based billing, webhook lifecycles, and reliable event processing.
SymTek Safe: an app we built end to end
SymTek Safe is a production Shopify app we designed, built, and ship ourselves — crowdsourced package protection with an opt-in toggle in the cart and checkout, protection-fee logic, a merchant analytics dashboard, and a live App Store presence. It is direct proof we can take a Shopify app from concept, through review, to real merchants. Want an app like this? We have done it end to end.
Frequently Asked Questions
How much does a custom Shopify app cost?
It depends on scope. A focused checkout UI extension or a small private app typically runs a few thousand to low five figures; a full public App Store app with billing, integrations, and review is a larger build. We scope every project up front and give you a fixed range before any code is written.
Should I build a custom app or use a public one?
If an existing App Store app does the job, install it. Build custom when no app fits your workflow, when you need logic tied to your own systems, or when a public app forces compromises you can't live with. A private Shopify app is often cheaper long-term than bending your operation around off-the-shelf software.
How long does it take to build a Shopify app?
A single checkout extension or a focused private app can ship in a few weeks. A public App Store app — with billing, GDPR webhooks, and Shopify's review — generally takes a couple of months. We give you a timeline with milestones after scoping the work.
Do you handle the Shopify App Store review?
Yes. We build to Shopify's requirements from day one — OAuth, mandatory webhooks, the billing API, and performance standards — then manage submission and the back-and-forth with Shopify's review team until the app is approved and listed.
Can you build checkout extensions on Shopify Plus?
Yes. Checkout UI extensions require Shopify Plus, and that's where we work — custom fields, opt-in upsells, validation rules, and branded content on the checkout and Thank You pages. Everything is built on Shopify's extension framework, so it survives platform updates instead of breaking on them.
Do you offer ongoing maintenance after launch?
Yes. Shopify ships breaking changes and new API versions on a schedule, and a live app needs monitoring, updates, and support. We offer ongoing maintenance to keep your app current, compliant, and running smoothly as Shopify evolves.