Shopify app developer for builds the app store can't solve.

App types Tom builds

• Public Shopify apps Listed in the App Store. OAuth, billing API, webhooks, GDPR endpoints, App Store review compliance.
• Custom (single-merchant) apps Installed on a specific Shopify or Shopify Plus store with full Admin GraphQL access; no Partner-account billing layer.
• Theme app extensions Script-tag-free blocks rendered server-side from the app. Theme-store-safe and survive theme upgrades.
• Checkout UI extensions Payment, shipping, post-purchase, and Thank-you page extensions on Shopify Plus checkout.
• Customer account UI extensions Order index, order status, profile-page blocks.
• Shopify Functions Discount, Delivery, Cart Transform, Payment, Fulfillment Constraint, Order Routing — Rust or JavaScript.
• Hydrogen / headless storefronts Hydrogen on Oxygen, Storefront API patterns, third-party caching, B2B, Markets, Combined Listings.
• Admin embedded UI Polaris-native embedded app UI for the Shopify admin — single-page app or multi-route.

Apps + extensions in published work

Live examples of custom Shopify app builds, each backed by a case study with architectural sketch and runnable code.

• Custom Shopify loyalty program11 Shopify extensions — checkout UI, customer-account, 7 theme blocks. Native Functions.
• Apple Wallet pass programCustom app backend + theme block. APNs push from Shopify webhooks.
• Subscription migration Remix appCustom Remix app — bulk CSV importer, signed-link bridge, Discount Function with HMAC.
• Amazon Connect screen-pop app10+ systems wired together; PCI-compliant phone payments.
• Briefs — 20+ apps & extensions sketchedB2B portals, Functions, shipping integrations, custom checkout flows.
• Custom-apps generatorDescribe what a store needs; get 1–4 real app concepts back.

Shopify app developer FAQ

What types of Shopify apps does Tom build?

Public apps for the Shopify App Store, custom single-merchant apps, theme app extensions, checkout UI extensions on Shopify Plus, customer-account extensions, Shopify Functions, and Hydrogen storefronts.

Does Tom handle the Shopify App Store submission?

Yes — OAuth, billing API, webhooks, GDPR webhooks, App Store review compliance, and submission are part of public-app engagements.

Can Tom build checkout UI extensions on Shopify Plus?

Yes. Payment, shipping, post-purchase, and Thank-you page extensions. Checkout extensibility is a primary surface, not an afterthought.

Does Tom build theme app extensions?

Yes — script-tag-free blocks rendered server-side from the app, theme-store-safe, surviving theme upgrades.

Does Tom build Hydrogen headless storefronts?

Yes — Hydrogen on Oxygen, custom Storefront API patterns, third-party data sources with caching strategies, B2B Commerce on Hydrogen, Markets, and Combined Listings.

What tech does Tom write apps in?

Remix or Express for app backends, Node/TypeScript, Rust or JavaScript for Functions, Polaris for embedded admin UI, Hydrogen/React for storefronts, Postgres for state.