Shopify Plus developer for stores that have outgrown the app store.

What a Shopify Plus developer engagement covers

The categories below describe what Tom builds directly against the Admin GraphQL and Storefront APIs, on Shopify Plus extension surfaces.

• Custom Shopify apps Public, custom (single-merchant), theme app extensions, checkout UI extensions, customer-account extensions.
• Shopify Functions Discount, Delivery, Cart Transform, Payment, Fulfillment Constraint, Order Routing — Rust or JavaScript.
• B2B on Shopify Plus Account-specific catalogs, contract pricing, Net 30 checkout gating, wholesale portals, ERP bridges.
• Native Subscriptions migrations Recharge or Bold → native Shopify Subscriptions, with grandfathered tier preservation and bulk CSV cutover.
• ShipEngine + carrier integration Live multi-carrier rates against the box the warehouse actually packs, with failover and carrier-cutoff promises.
• Apple Wallet pass programs Order tracking + loyalty + subscription + gift card on one self-updating pass with APNs push.
• AI agent readiness Schema.org, llms.txt, agent-readable product feeds, canonical URLs — the four layers that get a store cited by ChatGPT, Claude, Perplexity, AI Overviews.
• Custom loyalty engines Postgres-backed point ledgers, fraud-checked referrals, FIFO expiration, native Functions for point math.

Recent published work

Long-form case studies of real builds. Each carries the architectural sketch, validated runnable code, and JSON-LD structured data.

• Apple Wallet pass integration for ShopifyOrder, loyalty, subscription, gift card on one pass — APNs push updates.
• Subscription migration that kept the tier pricesRecharge → native Shopify Subscriptions, HMAC-signed guest-cart pricing.
• Custom Shopify loyalty past the SaaS ceiling11 UI extensions, Postgres point ledger, fraud-checked referrals.
• AI product discovery for Shopify storesThe four layers that make a store legible to AI agents.
• Amazon Connect call center for ShopifyCaller-ID-to-customer lookup, screen pop, PCI-compliant phone payments.
• Briefs index — 20+ anonymized case studiesB2B, Subscriptions, Functions, shipping, loyalty, agent readiness.

Shopify Plus developer FAQ

What size merchant does Tom typically work with?

Mid-market — roughly $1M–$50M GMV. The size where off-the-shelf Shopify apps run out of room and a salaried in-house engineer is more weight than the work needs.

Is Tom a Shopify Plus Partner agency?

No. Tom is an independent solo developer — one developer, direct work, no agency or account-management layer. Engagements are scoped per build, not per hour.

Does Tom build custom Shopify Functions?

Yes — Discount, Delivery Customization, Cart Transform, Payment Customization, Fulfillment Constraint, Order Routing Location Rule, and Local Pickup Delivery Option Generator Functions in Rust or JavaScript.

Can Tom migrate from Recharge to native Shopify Subscriptions?

Yes — Recharge-to-native and Bold-to-native Subscriptions migrations are a recurring engagement, including hundreds of in-flight recurring customers, without re-collecting payment methods, preserving tier pricing.

Does Tom build Shopify Plus B2B portals?

Yes — account-specific catalogs, contract pricing, Net 30 checkout gating, wholesale portals with signed bridges from legacy systems, and Shop Pay Installments controls for high-value orders.

What integrations does Tom work with most?

ShipEngine, Klaviyo, Recharge (migrations off, not configuration), Apple Wallet, and Amazon Connect.