Custom Shopify App Development
I build private Shopify apps that do the work a theme cannot: recurring billing, merchant portals, webhook pipelines and the jobs that have to keep running after checkout.
When a theme is not enough
A Liquid theme can sell a product. It cannot own a subscription relationship. Recurring meal delivery, skip-a-week flows, webhook-driven fulfilment and billing that clusters around renewal dates all live in an app — talking to Shopify through the Admin API, not through a section setting.
That is the work I do as a Shopify app developer: private apps for a specific merchant, built on Remix, with GraphQL as the contract against Shopify and serverless functions for the work that has to keep running after the customer leaves the storefront.
Proof: ThriveMeals subscription app
ThriveMeals is an Australian meal-delivery business on Shopify. The storefront is a custom theme. The relationship after checkout is a custom subscription app I built so customers can swap meals, skip a delivery or pause entirely without contacting support — the single biggest lever on churn in a subscription food business.
Recurring billing and webhook processing run on AWS Lambda, deployed with the Serverless Framework. Subscription load is spiky: renewals cluster around billing dates and sit near-idle in between, so serverless absorbs the peaks without paying for capacity the rest of the week. The app uses Remix and GraphQL against the Shopify Admin API; the theme hands off bundle pricing and delivery scheduling into that flow.
What a custom Shopify app typically covers
- Subscription billing cycles, dunning and customer self-service (skip, pause, swap)
- Admin API and Storefront API integrations, including metafields and webhooks
- Remix app structure with authenticated Shopify session tokens
- Background jobs on AWS Lambda for renewals, fulfilment events and scheduled sync
- Merchant-facing dashboards that sit next to Shopify Admin rather than replacing it
How I work with the theme
The app and the theme are one product from the merchant's point of view. I usually own both, which is why the ThriveMeals card sits under Shopify Stores and Shopify Apps. If you already have a theme, the app still has to respect the ordering flow that feeds it — I will not drop a Remix app onto a storefront whose checkout path cannot hand off cleanly.
Remix, GraphQL and the Admin API in practice
Shopify's own app platform has settled on Remix. I follow that: authenticated session tokens, App Bridge where the merchant needs an embedded admin view, and GraphQL for every Admin API call so the app asks for the fields it uses instead of dragging REST payloads across the wire. Webhooks are verified, idempotent and retried — a missed subscription renewal is a refund conversation, not a log line.
Serverless is not a fashion choice. Recurring billing is bursty. Lambda plus the Serverless Framework means the renewal window can scale without an always-on Node process sitting idle in ap-southeast-2 for three weeks. When a merchant asks for "just a Shopify app", this is the part I actually scope: what runs in the request, what runs on a schedule, and what Shopify already does so we do not rebuild it.
Who this is for
Merchants who have outgrown a plug-in subscription app. Product teams that need a private app talking to an existing fulfilment or CRM stack. Agencies that want one engineer who can also own the Liquid theme the app has to sit inside. Based in Mohali, Punjab, I ship this for Australia, the UK, the US, the EU, GCC and Canada. Start at hire a Shopify developer or the contact form.