Custom Shopify applications
Embedded Admin apps for operational work the Shopify admin doesn't cover — bulk catalog edits, metafields at scale, and workflows shaped around how your team actually works. Remix, Polaris, and the Admin GraphQL API.
Custom Shopify applications & AWS integrations
Built for the work your business runs on.
Custom Shopify applications and AWS integrations for catalog, order, and operational
workflows — from a hundred products to hundreds of thousands.
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What I do
Three kinds of work, all of it for merchants and agencies who have outgrown off-the-shelf apps and theme customization.
AWS integrations & pipelines
The serverless backends behind the storefront: catalog sync from external systems, queue-based processing, and verification after every write. Lambda, DynamoDB, SQS, and S3 — sized from a hundred products to hundreds of thousands.
Application review
Inherited an application, or had one built fast with AI, and need to know where you stand? I reconstruct what it actually does, test its critical paths, and hand back a risk-ranked list of what to fix first.
Selected work
Shipped systems, described in plain terms. I demo the live applications on a call rather than leaving them open here.
Bulk product create & update
A serverless AWS system that syncs product catalogs from external sources into Shopify — creating, updating, and verifying products as a continuous pipeline.
Runs daily in production. First put to work on a live catalog of over 500,000 products.
Shopify taxonomy & category mapper
Classifies any store's catalog against Shopify's Standard Product Taxonomy — deterministic rules first, AI only where they fall short, with human review before anything is written back.
Run once across a live catalog of over 500,000 products. New products are now classified in the daily import.
Taxonomy import enricher
A standalone service in a daily ERP-to-Shopify pipeline. It classifies each incoming product against a reviewed rule set and stamps the batch before the importer sees it, so categorization happens automatically as part of the daily run.
Runs in production with every daily import.
Collection Price Updater
An embedded Shopify Admin app that repriced every product in a collection at once, with an exact preview before the change and one-click rollback after it.
Metafield Manager
An embedded Shopify Admin app for applying a consistent set of product metafields across a catalog, from a single product to thousands, with a full audit log.
Currently taking on new client work.
I'm a senior Shopify app developer with more than 30 years of engineering experience, based in Boise, Idaho and working with clients remotely. If you have a workflow that off-the-shelf apps can't safely handle, or an application you're not sure you can trust, I'd like to hear about it.
Email don@donstefani.com