Shopify Functions
Cart-line discounts, delivery-method selection, payment gating, shipping-rate customization. Rust or TS against Shopify’s WASM runtime — the modern replacement for Scripts.
Solo operator for the Shopify Plus surface — Functions, Flow, Wholesale, Markets, Combined Listings, and custom private apps. Priced for D2C brands between $1M and $30M annual revenue that need senior accountability without an enterprise agency org chart.
A Shopify Plus developer is a senior engineer who builds and maintains storefronts on Shopify Plus, the enterprise tier of Shopify. The work spans Shopify Functions for server-side checkout customization, Shopify Flow for backend automation, Wholesale for B2B, Markets for multi-currency, Combined Listings for merged variants, and custom private apps against the Admin GraphQL and Storefront APIs.
Plus is not a status upgrade — it is a capability upgrade. Three trigger conditions in practice: revenue crossing about $1M annually with a plan to double, checkout or cart logic that Basic cannot express, or international expansion where Markets replaces the multi-store hack.
Below those triggers, staying on Basic and buying targeted apps is genuinely cheaper. My job on that call is to tell you if Plus is actually the right move — not to sell you the tier.
Above those triggers, Plus earns its price by unlocking Functions, Flow, Wholesale, Markets, and the private-app surface. This page is for the brand at that inflection point that wants a senior operator to build the Plus stack without a Plus-partner agency org chart wrapped around it.
Three paths, three unit economics. Here is how a D2C brand at the Plus inflection point decides between them.
| Dimension | Solo Plus operator (this offer) | Plus-partner agency | Stay on Basic |
|---|---|---|---|
| Typical Plus build cost | ₹5L – ₹12L | ₹15L – ₹60L+ | Not applicable |
| Who writes the code | Senior, end-to-end | Junior dev + PM layer | You outgrow it |
| Functions development | Included | Scoped separately | Not available |
| Flow builds | Included | Scoped separately | Trigger-limited on Basic |
| Wholesale / Markets | Included in full-stack tier | Scoped separately | Not available |
| Plus subscription (Shopify) | Not included — paid to Shopify | Not included | ~$2,300/mo starts here |
| Reply time | ≤ 24h | 2 – 5 business days | — |
| Best fit | D2C $1M – $30M AOR | Enterprise + procurement badge | Under $1M AOR without complex logic |
Brand is between $1M and $30M AOR and needs a senior operator who owns Functions, Flow, Wholesale, Markets end to end.
Brand is above $30M AOR, has procurement rules that require a Plus-partner contract, or needs a full team org chart.
Under $1M AOR, no complex checkout logic, no international or B2B plans. Save the ~$2.3K/month and buy targeted apps.
Not every D2C brand should move to Plus. These are the profiles where the ~$27,600/year Plus subscription earns its price back through capability, not status.
Not sure if your brand fits? Send the brief and I’ll tell you honestly whether Plus is actually right — including when the honest answer is “stay on Basic.”
Cart-line discounts, delivery-method selection, payment gating, shipping-rate customization. Rust or TS against Shopify’s WASM runtime — the modern replacement for Scripts.
High-risk order routing, low-stock reorder triggers, VIP tagging, refund-abuse detection, subscription lifecycle. Bridged to custom code where Flow triggers stop.
Customer-tag catalogs, per-company price lists, quantity rules, invoice-based checkout. Private app layer where B2B needs cross into hierarchies and credit terms.
Multi-currency, multi-language, per-market pricing, hreflang-clean international SEO. Replaces the one-store-per-country hack for most D2C.
Merged product variants across the catalog, structured content via metaobjects, storefront rendering via metafield-driven sections. Real Plus-specific architecture.
Admin GraphQL, Storefront API, Webhook-driven workers. For the workflows that live outside Shopify’s built-in surface — ERP sync, custom reporting, marketing platform bridges.
Mum & You migrated from Magento onto Shopify Plus in Q2 2025. Plus was the destination for a specific reason: their subscription flow, private-app extensions, and B2B path all needed capabilities Basic Shopify does not expose.
The build wired Shopify APIs for subscriptions, private-app workflows for cross-system sync, and the Plus surface for the parts of the business that Basic could not have expressed. The team moved into a more manageable commerce stack with room to scale on both the D2C and the operations side.
Outcome
Stack
Shopify Plus · Private apps · Admin GraphQL · Storefront API
Plus builds at agencies float somewhere between ₹15 lakh and ₹60 lakh with the actual number gated behind three discovery calls. Published tiers make it possible to plan the year without that dance.
Every engagement comes with a written scope before any work starts. Note: the numbers below do not include the Shopify Plus subscription itself (~$2,300/month, paid to Shopify).
Brands launching on Plus with checkout customization
Brands adding B2B and international at once
Brands moving onto Plus from another platform
One or two Functions on an existing Plus store
Ongoing Plus dev, Flow tuning, Functions iteration
Plus fit check — revenue, checkout logic, B2B and international state. Honest answer if Basic is still the right tier.
Fixed price, timeline, Definition of Done. Which surfaces (Functions/Flow/Wholesale/Markets) are in scope.
Custom theme, Functions, Flow rules, private apps, Markets config — all in a Plus dev store first.
DNS, gateway reauth, subscription migration, day-one monitoring across every Plus surface.
Written runbook, dashboards, monitoring. Retainer available for ongoing Flow/Functions iteration.
A Shopify Plus developer is a senior engineer who builds and maintains storefronts on Shopify Plus — the enterprise tier of Shopify. The work covers Shopify Functions for server-side checkout customization, Shopify Flow for backend automation, the Wholesale channel for B2B, Markets for multi-currency and multi-region, Combined Listings for merged product variants, and custom app development against the Admin GraphQL and Storefront APIs. Plus builds are architecturally different from Basic Shopify builds — they earn the price by unlocking customization surfaces that Basic cannot reach.
Three trigger conditions in practice: (1) revenue crossing about $1M annually with active plans to double, since Plus subscription starts around $2,300/month and pays back at that scale; (2) checkout or cart logic that Basic Shopify cannot express — subscription bundling, dynamic pricing, gift-with-purchase rules, or B2B minimums; (3) international expansion where Shopify Markets replaces the multi-store hack. Below those triggers, staying on Basic and buying targeted apps is cheaper.
A Shopify Plus build runs ₹5,00,000 to ₹12,00,000 ($6,000 to $14,000) depending on scope. The floor covers a Plus-native custom theme with Functions and Flow wired in. The ceiling covers a full Plus stack with Wholesale, Markets, Combined Listings, subscription API integration, and custom private apps. Pricing is published upfront — no discovery call required.
Yes. Shopify Functions replace the retired Scripts model for checkout customization on Plus. Common Functions engagements: cart-line discount logic (spend-threshold gifts, tiered discounts), delivery-method selection (postal-code gating, weight-based rules), payment-method customization (hide/rename gateways per cart), and shipping-rate customization. Written in Rust or TypeScript against Shopify’s WebAssembly runtime.
Yes — Flow is Plus-only for the advanced connectors. Common Flow builds: high-risk order review routing, low-stock reordering triggers, VIP customer tagging, refund-abuse detection, subscription lifecycle automation. Where Flow’s built-in triggers do not cover the case, we bridge to custom code via a private app or a webhook worker.
Yes. Plus’s Wholesale channel is the right pattern for D2C brands adding B2B without splitting the storefront. Scope: customer-tag-based catalogs, price lists per company, quantity rules, invoice-based checkout, and rep-assisted ordering. For heavier B2B needs — company hierarchies, purchase orders, credit terms — we layer a private app on top.
Markets replaces the old “one Plus store per country” hack. One storefront handles multi-currency, multi-language, per-market pricing, and per-market checkout localization. My builds prefer Markets over the multi-store approach for most D2C — cheaper, easier to maintain, and SEO-cleaner via hreflang.
Yes — see the dedicated migration page. Magento → Shopify Plus, WooCommerce → Shopify Plus, legacy Shopify → Plus. Plus migrations run ₹4,00,000 to ₹8,00,000 with subscription API port, private app rebuild, and 14-day post-cutover monitoring included.
Send a one-page brief — brand, current platform, why Plus is on the table, the checkout/B2B/international feature that triggered the conversation, target ship date, budget range. I reply inside 24 hours with a scope estimate and a calendar slot. After the call, you get a written proposal with a fixed price, a timeline, and a Definition of Done. If it fits, we start.
Brand, current platform, why Plus is on the table, the checkout or B2B or international feature that triggered the conversation, target ship date, budget range. One page. I reply inside 24 hours.