Custom Ecommerce Development

Custom ecommerce development, for businesses no template can hold.

Configure-to-order products. Serialized parts. Dealer pricing. Quote workflows. Checkout and payment flows no app store covers. When your selling model breaks templates, we build the custom modules, middleware, and front ends that make the store work the way the business does, on Magento, Adobe Commerce, Shopify Plus, and BigCommerce rather than from scratch. Senior engineers, 16+ years, no junior bench.

4.8/5 from 800+ verified client reviews
Trusted by 300+ brands
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Why brands come to us

When the app store runs out, the workarounds start costing real money.

Most stores fit a platform. Yours might not. Contract pricing held together with spreadsheet exports, an order path that needs three manual steps because no plugin understands your approval chain, an ERP that drifts out of sync nightly. That is where custom ecommerce development earns its keep: purpose-built modules, middleware, and front ends that encode how you actually sell. We build the custom layer on the platform you already run, so the differentiated parts are yours and the commodity parts stay on proven rails. If the build is more standard than that, our ecommerce development team covers the full multi-platform range.

16+ yrs
Building custom commerce, since 2008
300+
Brands shipped worldwide
$10B+
In client GMV powered
94%
Client retention after launch
Partnerships · Reviews · Awards

Credentials & recognition.

Client-first approach

We're here to help you win, plain and simple.

Same senior team from kickoff to launch and beyond. We do not outsource, we do not disappear after go-live, and we do not hand you off.

Client TestimonialWatch their story
Client TestimonialWatch their story
94%
Client retention

Across every phase. Discovery, build, launch, and growth, the same senior team stays with you.

What our custom development team builds

Custom modules, middleware, and front ends, on the platform you already run.

Every engagement is scoped to the gap between what your platform does and what your business needs. The same senior engineers carry it from requirements to production.

/01Custom Magento module developmentBespoke Magento modules for pricing engines, configure-to-order logic, serialized inventory, and workflows no marketplace extension covers, built to coding standards so upgrades never break them./02Adobe Commerce custom developmentAdobe-certified engineers extending Adobe Commerce for enterprise catalogs, multi-store pricing, and custom quote and approval flows that the platform alone cannot express./03Custom Shopify app developmentPrivate Shopify and Shopify Plus apps for subscription logic, custom checkout and payment flows, fulfillment rules, and product configurators, coded to Shopify's security and review standards./04Headless and custom front endsCustom React and Next.js storefronts over your platform's commerce API, for experiences a native theme cannot reach while catalog, orders, and checkout stay on proven rails./05Magento integrations and middlewareTwo-way middleware between Magento and your ERP, WMS, PIM, or payment stack, so inventory, orders, and tiered pricing sync in real time instead of through CSV exports./06Adobe Commerce integrationsDeep ERP and back-office integration on Adobe Commerce, including NetSuite and SAP, mapped to your actual order lifecycle rather than a connector's default assumptions./07Custom B2B portals and configuratorsDealer portals, role-based pricing, RFQ and quoting workflows, and product configurators that generate SKUs and BOMs on the fly, built on top of your existing store./08Conversion-led custom UXCustom checkout steps, quote flows, and buying paths designed around how your customers actually purchase, then tested so the engineering pays back in conversion./09Performance engineeringCustom code that stays fast under load. We profile, cache, and harden bespoke modules and front ends so peak traffic and big catalogs never take the store down.
Custom on a platform or fully bespoke

Custom on a platform, or a fully bespoke stack?

"Custom" does not have to mean "from scratch." The real decision is where the custom code lives: as modules, apps, and front ends on a commerce platform, or as an entirely bespoke application you own end to end. We have built both, and for most businesses the first is the right answer.

Custom on a platform

Your custom logic ships as Magento and Adobe Commerce modules, Shopify apps and checkout extensions, BigCommerce apps, or a headless front end over the platform's API. The platform keeps handling catalog, cart, checkout security, PCI, and upgrades, while the custom layer encodes what makes your business different. You get bespoke behavior with a fraction of the maintenance surface, and platform releases keep delivering improvements you never have to build.

Best when
  • Your core flows fit a platform, with custom logic on top
  • You want PCI, checkout, and security handled for you
  • Maintenance budget should fund features, not plumbing
Fully bespoke stack

A ground-up application gives you total control: every data model, every screen, every rule is yours. It also makes you responsible for everything a platform normally absorbs, including checkout security, PCI compliance, hosting, and every future upgrade, forever. It is the right call for a narrow set of businesses whose commerce model genuinely cannot be expressed on any platform, and an expensive mistake for everyone else. We will tell you honestly which side of that line you are on.

Best when
  • No platform can model your core transaction at all
  • You have an engineering team to own the stack long term
  • Control is worth more than platform economics

Want the experience layer custom but the engine on platform rails? Start with headless commerce development.

Why IWD

Custom code is a liability unless the right people write it.

Every line of custom code is something someone has to maintain. We keep that surface small, write it to platform standards, and stay on after launch so it keeps working as your platform and your business move.

  • Custom where it pays, platform where it doesn't

    We write custom code for the parts of your business that are genuinely unique, and lean on the platform for everything that isn't. You pay for differentiation, not for reinventing a cart.

  • Built on platforms, not from scratch

    Every custom module, app, and front end we ship runs on Magento, Adobe Commerce, Shopify Plus, or BigCommerce. You get bespoke behavior with platform-grade security, checkout, and upgrades underneath.

  • Senior engineers, no junior bench

    Custom work is where junior mistakes get expensive. The Adobe-certified engineers who scope your build are the ones who write it, from kickoff through launch.

  • 16+ years of custom commerce

    We have built custom commerce since 2008, across 300+ brands and more than $10B in client GMV, and 94% of clients keep us on after launch.

How we work

From your selling model to shipped custom code.

01

Map the model

We sit with your team and map how you actually sell: pricing rules, order paths, approvals, and the systems behind them. The requirements doc reflects your business, not a template.

02

Draw the line

We decide together what the platform handles natively and what genuinely needs custom code, then scope the custom layer with a firm, itemized quote before anything is written.

03

Build and prove

Two-week sprints with weekly demos. Custom modules ship with automated tests and code review, so every piece is proven against your real data before it touches production.

04

Run and extend

After launch we monitor, patch, and keep custom code compatible with platform upgrades, then extend it as the business changes. The team that built it stays on it.

Questions, answered

What brands ask before commissioning custom development.

The questions we hear most before a custom build starts. If yours isn't here, just ask.

When does custom ecommerce development beat off-the-shelf?

When your selling model is the problem, not the theme. Configure-to-order products, serialized parts, dealer networks, contract pricing, multi-step approvals, and deep ERP logic all break standard plugins. If you are stacking apps and workarounds to approximate how you sell, a custom build is usually cheaper and more reliable than the pile of compromises.

Do you build from scratch or on top of a platform?

On top of a platform, deliberately. We build custom modules, apps, middleware, and front ends on Magento, Adobe Commerce, Shopify Plus, and BigCommerce. Fully bespoke stacks make you responsible for checkout, security, and PCI forever. Building the custom layer on a proven platform gives you the same differentiation at a fraction of the long-term cost.

Can you build custom checkout and payment flows?

Yes. We build custom checkout steps, payment integrations, and order flows: niche payment providers, net terms and purchase orders for B2B, split shipments, deposits, and quote-to-order conversion. On Shopify Plus that means checkout extensibility, and on Magento and Adobe Commerce it means custom payment and checkout modules built to platform standards.

What does custom ecommerce development cost?

It depends on how much of your selling model needs custom code versus platform configuration. A single custom module or integration is a much smaller engagement than a custom B2B portal with configurators and ERP middleware. We scope against your actual requirements and give you a firm, itemized quote before any work begins, so the number is known up front rather than discovered later.

Who owns the custom code you write?

You do. Custom modules, apps, and front ends we build for you are delivered in your repositories under your accounts, documented so any competent team can maintain them. There is no proprietary lock-in and no license fee back to us. Most clients keep us on to extend the work, but that is a choice, not a trap.

How do you scope and quote a custom build?

We start with a working session on your selling model and systems, then split requirements into what the platform covers natively and what needs custom engineering. You get a phased plan with a firm, itemized quote on the custom layer, including integration points, test coverage, and upgrade strategy, before a line of code is written.

Build the store that works the way your business does.

Tell us where the platform stops and your workarounds start. We will come back within one business day with a plan for the custom layer, a real timeline, and a real number.

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