E-commerce Platform Development by Alpha Expansion
Commerce Engineering01Headless storefronts02Custom checkout03ERP integrationsBook a call

E-commerce Platform Development

Storefronts builtto convert

We build custom and headless commerce platforms for retailers and B2B sellers whose catalog, pricing or checkout has outgrown a standard store, with storefront, back end and integrations engineered together.

Headless storefrontsCustom checkoutERP integrations
Headless storefronts
Custom checkout
01Our Approach

We build commerce around how you actually sell, with pricing rules, inventory and checkout logic in code you own instead of plugin workarounds.

02Overview

Commerce built for the way you sell

  • 01Headless storefronts
  • 02Custom checkout
  • 03ERP integrations

This service covers commerce that a theme and a handful of apps cannot handle. We build headless storefronts on Shopify, Medusa or a custom back end, along with custom checkout flows, multi-store and multi-currency setups, subscription billing, B2B pricing and the integrations that keep stock, prices and orders in step with your ERP, product information and warehouse systems.

If a standard Shopify or WooCommerce store meets your needs, keep it, and we will tell you so. Custom engineering is worth it when business rules, catalog size, traffic peaks or back-office integration keep forcing workarounds. We start by mapping how orders, stock and money move through your business, then decide which parts to buy, which to configure and which to build.

Talk to us about your project
03What We Do

Capabilities, End to End

01
Headless storefronts

Next.js storefronts connected to Shopify, Medusa or a custom commerce API, with server rendering, image optimization and caching tuned for fast product and category pages.

02
Custom checkout

Checkout flows shaped around your funnel, including guest and account purchase, saved carts, split shipments, tax and duty handling, and the payment methods your markets expect.

03
Catalog and search

Product data models for large or complex catalogs with variants, bundles and attributes, plus faceted search and merchandising rules through Algolia or Elasticsearch.

04
Inventory and integrations

Two-way synchronization of stock, prices, orders and fulfillment status with ERP, PIM and warehouse systems, using queues and retries so a failed call does not silently drop an order.

05
Multi-store and B2B

Multiple storefronts, currencies and languages run from one back end, with customer-specific price lists, quote requests, approval steps and account hierarchies for business buyers.

06
Subscriptions and payments

Recurring orders with skip, pause and swap options, dunning and proration, built on Stripe, Adyen or Braintree so card data stays with the payment provider.

04In Production

What It Looks Like When It Ships

app.novashop.io/overview
Live
Nova Shop
Store / Overview
Search...
⌘K
MC
WORKSPACE
Overview
Orders
Products
Customers
MORE
Discounts
Analytics
Settings
Usage
72% of plan
Inventory
1,204 SKUs across 3 warehouses
AllLowOut
Reorder
3 items below reorder point - suggested PO ready
Review
Product
SKU
Stock level
Status
Sneaker Low
SKU-1042
82 units
In stock
Canvas Tote
SKU-1043
34 units
In stock
Wool Runner
SKU-1044
12 units
Low
Trail Jacket
SKU-1045
0 units
Out
Headless storefronts
Custom checkout
ERP integrations
Fast catalogFlexible checkoutLive inventoryCustomer pricing
05What You Receive

Handed Over, Ready to Run

SCROLL
01
Production storefront and back end
02
Custom checkout and payment integration
03
Catalog data model and import tools
04
ERP, PIM and warehouse connectors
05
Search and merchandising configuration
06
Admin tools for your operations team
07
Load test results and monitoring dashboards
08
Source code, documentation and environment access
06How It Runs

From Kickoff to Launch

01
Map the operation
02
Design the store
03
Build in slices
04
Migrate and launch
01
Map the operation

We trace how products, prices, stock, orders, payments and returns move through your business and systems today. The result is an architecture decision about what to buy, configure and build.

02
Design the store

We design storefront, cart, checkout and account areas alongside the data model and integration contracts, so the interface and the systems behind it are specified together before development starts.

03
Build in slices

Development runs in vertical slices, from browsing to paid order, each deployed to a staging store with test payments. Integrations are built against sandbox systems and verified with real product data.

04
Migrate and launch

We migrate products, customers and order history, set redirects to protect search rankings, load test the peak scenario, then cut over at a quiet time with monitoring and a rollback plan.

07Technology

The Stack We Use

StorefrontNext.jsReactTypeScriptTailwind CSSDataPostgreSQLRedisAlgoliaElasticsearchStorefrontNext.jsReactTypeScriptTailwind CSSDataPostgreSQLRedisAlgoliaElasticsearch
CommerceShopifyMedusacommercetoolsStripeAdyenPlatformAWSVercelAmazon CloudFrontSanityContentfulCommerceShopifyMedusacommercetoolsStripeAdyenPlatformAWSVercelAmazon CloudFrontSanityContentful
08Who It Is For

Built for Teams Like Yours

FLAGSHIP
Your store has outgrown its off-the-shelf platform

Every new requirement means another plugin or manual workaround. Pricing rules live in spreadsheets, stock goes out of sync with the warehouse, and the checkout cannot be changed the way you want. You need a platform shaped around your operation that your team fully controls.

High-volume retail catalogs
B2B ordering portals
Subscription and replenishment commerce
Multi-brand or multi-region stores
Replatforming from legacy commerce
Flash sales and drops
09Questions

What buyers ask before they start

If yours is not here, ask us directly. The first conversation is free and useful whether or not we work together.

Book a call

A standard store is the right answer for many businesses, and it costs far less to run. Custom or headless work pays off when you need pricing or checkout logic the platform does not allow, deep integration with back-office systems, several storefronts on one catalog, or front-end performance and design beyond what themes permit. We often keep Shopify as the engine and build around it.

Migration is planned as its own workstream. We script the transfer of products, customers, order history and content, run it repeatedly against staging and reconcile counts before the real cutover. For search, we map every old address to its new one with redirects and carry over metadata and structured data. Rankings can still fluctuate after any replatforming, so we monitor closely and fix issues quickly.

We design checkout so card details go directly from the shopper's browser to the payment provider through its hosted fields, and never touch your servers. That keeps your PCI DSS scope as small as possible. Around it we apply strict access control, secret management, webhook signature checks and audit logging. Your own compliance assessment remains yours, and we build to support it.

We design for the peak instead of the average. Catalog pages are cached at the edge, while cart, stock and checkout run on services that scale horizontally and protect inventory from overselling. Before launch and ahead of major events we run load tests that model your expected peak, find the bottleneck and fix it. Monitoring and alerts are set up so problems are seen early.

Anything with an API, file exchange or database we are permitted to reach. Common integrations are ERP and accounting systems, product information management, warehouse and shipping providers, tax services, email and customer data tools, and marketplaces. For older systems without an API we build scheduled imports and exports. Each integration gets its own error handling, retry logic and a log your team can inspect.

10Related services

Often built together

ReadytoBuildSomethingExceptional?

Every engagement starts with a scoping conversation. It is free, structured, and useful whether or not we work together.

Response within 24 hoursFree consultation & scopingNDA available on request

Premium digital product and engineering studio. We build high-performance web platforms, SaaS applications, mobile apps, and 3D experiences for high-growth companies.

Alpha Expansion is a premium digital product and engineering studio specializing in React development, Next.js development, full-stack development, mobile app development, UI/UX design, and 3D interactive experiences.

We serve industries including SaaS, FinTech, Healthcare, E-commerce, Logistics, and Real Estate.