A Shopify app designed and shipped end to end
I built a complete Shopify app, from installation on a store through to its visual integration into the theme.
The context
A Shopify app isn't just a piece of code running somewhere: it needs to install cleanly on a store, authenticate securely, react to store events in real time, and be able to integrate visually into the theme without the merchant touching any code. That's the full scope I built: an app that can be installed on any eligible Shopify store, not a prototype limited to a single use case.
The goal was to cover the entire technical chain Shopify expects from a distributable app, meeting its security and performance requirements.
What I did
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OAuth authentication
Set up Shopify's own installation and authorisation OAuth flow, with access-token management for each installed store.
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Receiving signed webhooks
Listened for events sent by Shopify (order created, product updated, app uninstalled), with systematic signature verification to reject any forged request.
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Theme extension
Built a block that plugs directly into the Shopify theme editor, letting the merchant position the feature without writing any code.
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Managing the app lifecycle
Handled uninstallation, Shopify plan changes and recurring billing, so the app stays consistent throughout its whole usage lifetime.
Frequently asked questions
Why does webhook signature verification matter?
Does the theme extension require technical skill from the merchant?
What happens if Shopify changes its APIs?
Can this app be installed on several stores at once?
Describe your need in one minute
A few targeted questions so I can reply with an estimate rather than another questionnaire.