Ian Fleming — Shopify Plus Engineer

Ian Fleming

Shopify Plus Engineer | Fullstack, Integrations & International Storefronts

I'm a fullstack Shopify Plus engineer working across storefront relaunches, apps and checkout extensions, analytics, and A/B testing. My deepest work is in integration — making independent platforms behave as one, for the kind of problem where three services disagree on a price, or a discount works in the cart but breaks at checkout.

Before engineering, I spent years getting complex, multi-party processes right the first time in IP administration — the same instinct I bring to integration work, where small errors compound.

DE · IT · CH · FR · NL · ES

Six storefronts. One reconciled price.

Featured work

Cart Discount Coordination Engine

Three systems, one price — in the cart and at checkout.

Customers were seeing one price in the cart and a different one at checkout — a trust-eroding problem generating recurring support tickets. Built an event-driven coordination layer that detects the active discount mode across Shopify, Rebuy Smart Cart, and manual input, and calculates accurate prices in real time. 12+ months in production, zero critical incidents, pricing-discrepancy complaints eliminated entirely.

JavaScript · Event-Driven Architecture · Shopify Ajax Cart · Rebuy Smart Cart

Read the case study → Technical docs

FounderVoice AI

Generic AI output vs. a founder's actual voice, side by side.

Founder writing is chunked, embedded, and stored in Pinecone under that founder's namespace. A prompt is embedded the same way, matched against those chunks, and used to ground an OpenAI completion in their actual style — rendered next to the same prompt run through a generic model, for direct comparison.

Next.js · TypeScript · OpenAI API · Pinecone

Live demo GitHub Docs

What I work on

Beyond the integration work above, my day-to-day spans the full Shopify Plus surface across an international estate of 7 live storefronts (6 running the cart engine).

International storefront delivery

A full site redesign taken from Figma to production and coordinated across the international estate — a multi-market theme relaunch, keeping design, behaviour, and currency handling consistent from one storefront to the next.

Apps and checkout extensions

A full-stack progressive discount app (Remix, Shopify Functions, GraphQL, Neon Postgres) with a merchant self-service UI, plus production checkout customisations: fraud-prevention validation, payment-method filtering, A/B-tested delivery options, and React-based UI extensions for real-time discount visualisation.

Integrations

The cart discount coordination engine above; a TikTok Shop integration spanning a five-system fulfilment chain — TikTok, Shopify, ERP, middleware, and warehouse — with tracking sync and carrier mapping; and Loop subscriptions, in progress.

Analytics and experimentation

Server-side GTM with GCLID-based attribution and Enhanced Conversions, GA4 segmentation via the Shopify Pixel, and Shoplift A/B testing with real production debugging across in-app-browser traffic.

Infrastructure

A geolocation-aware redirect system (Vercel Edge Functions) routing EU packaging QR codes to the right market.