Shopify Plus development agency services, engineered for scale

A Shopify Plus development agency builds, migrates and maintains stores on Shopify’s enterprise plan. In practice that means checkout extensibility and Shopify Functions work, native B2B builds with company accounts and price lists, custom public or private apps, ERP, CRM and 3PL integrations, expansion stores and international markets, replatform migrations, and the performance engineering high-volume stores need. Standard Shopify agencies rarely touch checkout or Functions, because standard Shopify does not expose them in the first place.

A Shopify Plus agency is a partner that works on Shopify’s enterprise plan, and the label covers two different businesses: marketing shops that run campaigns for Plus merchants, and development teams that engineer the store itself. What a Shopify Plus agency does on the development side is the work standard Shopify never exposes, from checkout extensibility and Shopify Functions to native B2B and expansion stores. The reason to hire a Shopify Plus agency is that each of those needs engineering rather than an app install, and a checkout mistake costs revenue on every order until it is fixed.

Shopify Plus development agency services generally run $20,000 to $150,000+ per build, depending on checkout, B2B and integration complexity. Smaller scopes — a checkout extensibility migration or a Shopify Functions project — start around $15,000, and ongoing Plus development retainers start at $4,000/month. We quote fixed scope before work begins, so there is no hourly meter and no surprise invoice. The number only changes if you change what you asked us to build.

Shopify Plus pricing starts at $2,300/month on a three-year term, or $2,500/month billed annually, plus variable platform fees at higher volumes. That fee is paid to Shopify and is entirely separate from development cost, which is a one-off project fee plus any retainer you choose afterwards. If your current revenue does not justify the platform fee yet, we will tell you on the scoping call rather than scope a build you do not need.

A full Shopify Plus build or replatform typically takes 8 to 16 weeks, depending on B2B and integration scope. A narrower project — a checkout extensibility migration or a Shopify Functions build — can ship in a few weeks. You get a project plan with milestones within 48 hours of the scoping call, before you commit to anything, so the timeline is on the table while you are still deciding whether to go ahead.

For enterprise Shopify Plus work, an agency is usually the right call. Checkout extensibility, Functions, native B2B and ERP integrations are beyond most freelancers, and a failed migration on a high-volume store costs real revenue for every day it takes to fix. An in-house team makes sense once you have continuous Plus roadmap work to keep it busy; before that you are paying salaries for idle capacity. Plenty of brands run both — in-house for iteration, an agency for the builds.

Ask for evidence on the Plus-only work first. A credible partner, whether it calls itself a Shopify Plus agency or a Shopify Plus web development company, can show checkout extensions and Functions it has shipped, explain how it would move your Script Editor logic, and describe native B2B builds rather than wholesale apps. Then check the basics: who writes the code, whether the quote is fixed scope, and what is documented at handover. Rankings of the best Shopify Plus agency options, or the top Shopify Plus agency in the USA, are fine for a longlist; the shortlist should come from scoping calls.

Yes, and if it has not happened yet it is urgent. Shopify retired checkout.liquid and legacy Scripts, and Scripts stopped executing on June 30, 2026, so any checkout customization, additional script or Script Editor discount logic has to be rebuilt on checkout extensibility and Functions. We rebuild checkout UI as extensions, port discount and shipping rules to Functions, and validate every checkout path — guest, logged-in, B2B, subscription — before cutover.

Yes. We build B2B Shopify Plus stores natively: company accounts, customer-specific catalogs, price lists, payment terms, quote and reorder flows, and custom wholesale ordering for complex sales models. Building on the native primitives rather than a wholesale app or a separate store means one catalog, one inventory source and one set of integrations to maintain. It also means your B2B checkout benefits from the same extensibility work as your D2C checkout.

Yes. Shopify Plus lets one organization run several storefronts, and there are two ways to use that. Shopify Markets sells into multiple countries from a single store with local currency, pricing and domains, which suits most international expansion. Expansion stores are separate storefronts under the same Plus organization, better for a second brand, a genuinely different catalog or a standalone wholesale store. We help you choose, then build shared theme architecture and integrations so more stores do not mean multiplied maintenance. Shopify Flow, Shopify’s automation app, can also keep tagging, inventory alerts and order routing consistent across them.

Yes. We replatform to Shopify Plus from Magento, Salesforce Commerce Cloud, BigCommerce and custom carts, with no lost products, customer data or SEO and minimal downtime. Every indexed URL gets a mapped 301 redirect, metadata and structured data carry over, and we verify Search Console after cutover rather than hoping. Order, customer and subscription data is migrated with reconciliation checks run on both platforms before DNS moves.

Yes. NetSuite is one of the ERPs we integrate with Shopify Plus, alongside Salesforce and HubSpot on the CRM side and 3PLs such as ShipBob. The scoping questions decide the build: which system owns inventory, pricing and customer records, how often orders and fulfillments sync, and how B2B price lists and payment terms map across. If your ERP is SAP, Microsoft Dynamics or Brightpearl, those questions are the same, and so are the ownership rules when product content lives in a PIM such as Akeneo rather than in Shopify.

Yes. We build custom public and private Shopify apps on the current Admin and Storefront APIs, and Shopify Functions for server-side discount, shipping, payment customization and cart transform logic. We build custom when off-the-shelf apps genuinely cannot cover the requirement, and we say so when an existing app can — every app you avoid is one less script slowing your storefront and one less renewal sitting on your stack.

Shopify Plus is worth it when you need the capabilities sitting behind the tier: checkout extensibility, Shopify Functions, native B2B, higher API limits and expansion stores. If your requirements are a custom theme, some apps and a fast storefront, standard Shopify does that, and we build on it too. The honest test is whether a specific capability sitting behind the Plus tier is blocking revenue right now. If nothing is, the platform fee is not buying you anything yet.

Yes — speed is treated as a feature on every Shopify Plus build we ship. Templates are held to a performance budget with a target LCP under one second, markup is clean and semantic, structured data is implemented properly, and the store is engineered for flash sales and high-traffic peaks rather than for a quiet demo day. Core Web Vitals feed rankings and conversion rate at the same time, so this work pays back twice.

Yes. We build headless storefronts with Shopify Hydrogen and Oxygen when sub-second performance and a fully custom front end justify the added complexity and ongoing maintenance. We will also tell you honestly when a well-built Plus theme gets you the same commercial result for less money and less long-term overhead — which, for most brands, it does. Headless is a trade-off to make deliberately, not an upgrade to buy by default.

Your Shopify Plus project is led by a senior Plus developer, with a dedicated project lead as your point of contact. You get a live staging store you can open at any time, a documented technical architecture, and clear milestones, so progress is something you look at rather than something you have to chase. The build is never quietly reassigned to a junior once the contract is signed.

After a Shopify Plus store launches, most brands keep us on a retainer covering platform updates, bug fixes, new features, integrations, performance work and on-store testing, starting at $4,000/month. You are not locked in, and the code is documented so your in-house team can take it over whenever that makes sense. Launch is where a Plus store starts earning — it is also where stores start quietly decaying without maintenance.

The call runs 30 minutes and is free. We go through what your checkout does today and what it relied on before Scripts retired — discount, shipping and post-purchase logic included — along with your B2B requirements, markets and every system that reads or writes order data. You come away knowing which of those need rebuilding as checkout extensions or Shopify Functions, and whether Plus justifies its platform fee for you yet. Within 48 hours you get a project plan and a fixed-scope quote, with no obligation to go ahead.

No. Enterprise briefs are rarely finished at this stage, and finishing the scope is what the call is for. Useful things to have to hand are collaborator access to the store, a list of apps and integrations, any checkout customizations you already know about, and your B2B or international plans. If a previous agency left an architecture document, send it over. Anything missing gets picked up in discovery, and the fixed-scope quote only goes out once every checkout path and integration is accounted for.

We specialize in Shopify Plus, but also build on standard Shopify. For enterprise needs, checkout extensibility, B2B, Functions, integrations, Plus is the right platform, and we build it to best practice.

Most Shopify Plus builds run $20,000 to $150,000+ depending on checkout, B2B, and integration complexity; smaller projects (a checkout migration or Functions work) start around $15,000. Shopify Plus itself is ~$2,500/mo. You get a fixed quote before any work begins.

Yes, and if you have not yet, it is urgent. Shopify retired checkout.liquid and legacy Scripts (Scripts stopped executing June 30, 2026), so customizations have to be rebuilt on checkout extensibility and Functions. We handle that migration end to end.

Yes. We replatform from Magento, Salesforce Commerce, BigCommerce, and custom platforms to Shopify Plus, with no lost data, products, or SEO, and minimal downtime.

Yes. We build for high-growth and enterprise Shopify Plus brands across the US, UK, and other English-speaking markets.

Senior Plus developers on every build, deep checkout extensibility, Functions, and B2B expertise, ERP/CRM integration experience, full QA, and post-launch support, with fixed-scope quotes.

For enterprise Shopify Plus, an agency. Checkout extensibility, Functions, B2B, and ERP integrations are beyond most freelancers, and a failed enterprise build or migration costs real revenue. An agency gives you a senior Plus team, dedicated QA, and post-launch support.

We build to accessibility best practices (semantic markup, contrast, keyboard navigation) and can run an accessibility audit on your existing Plus store to identify and fix issues.

You work with a dedicated project lead plus the senior Plus developer on your build, with a live staging store and clear milestones so you always know the status.