eCommerce Web Development Services
Payments, inventory, shipping, tax, accounting, and customer data all have to agree with each other. eCommerce development is mostly the work of keeping them agreeing while the catalogue grows underneath them.
Where the work actually is
What customers see is one layer. Underneath, every order touches half a dozen separate systems, and almost every serious store problem is two of them disagreeing about the same number.
The bit customers see
Your store
Gateways, saved cards, refunds, partial refunds, subscriptions, and multiple currencies.
Fails asPayment taken, order never created. The customer is charged and your system has no record of it.
Stock levels across warehouses, retail locations, and any other channel you sell through.
Fails asOverselling. Two people buy the last one because the sync runs every fifteen minutes.
Live rates, zones, weight and dimension rules, carrier labels, and tracking.
Fails asQuoted rates that don't match what the carrier charges you, which quietly erodes margin per order.
Rates by destination, digital goods rules, thresholds, and exemptions.
Fails asWrong tax collected on cross border orders, discovered months later during reconciliation.
Orders, refunds, and payouts flowing into whatever your finance team actually uses.
Fails asSomeone re-keying orders by hand every morning, with the errors that always come with that.
Accounts, order history, marketing consent, and anything feeding your email or CRM.
Fails asDuplicate customers, guest orders that never link to an account, and segments built on bad data.
Catalogue size changes everything
A build that's perfectly sensible at one size falls over at the next. Knowing which band you're in, and which one you're heading for, decides most of the architecture.
Under 500
products
500 to 5,000
products
5,000 plus
products
The work
Almost none of it is a store from scratch. Most of it is fixing, connecting, or extending a store that already takes orders.
Area 01
The rules that decide what someone can buy, at what price, with what shipping.
Area 02
Connecting the store to the systems that already run your business.
Area 03
Getting large catalogues in, keeping them accurate, and making them findable.
Area 04
Stores get slow for different reasons than websites, and the fixes are different too.
Replatforming
It's not one migration, it's four happening at once, and each has its own way of going wrong. Worth doing properly or not at all.
Move 01
Catalogue, variants, images, and attributes, verified by count and by sampling rather than assumed complete.
Move 02
History, addresses, and accounts. Passwords rarely transfer, so how customers get back in needs planning.
Move 03
Every product and category URL mapped and redirected before launch. Stores lose the most search traffic here.
Move 04
Payments, shipping, tax, and every integration rebuilt and tested on the new platform before anything switches.
The honest question first is whether you need to move at all. Plenty of replatforming projects are really performance or integration problems that could be solved where you already are, for far less. If search traffic is a concern, the URL side is covered under eCommerce SEO.
Which one do you need
These get bought interchangeably and they solve completely different problems. The quickest test is whether your store is doing the wrong thing, or doing the right thing badly.
This page
Different problem
Common questions
Usually the one you're already on. Platform choice matters far less than most comparison articles suggest, and moving costs more than people expect in both money and risk.
It becomes a real question when the platform genuinely can't do something your business needs, or when the cost of working around it every month exceeds the cost of moving.
Yes, and it's how most of this work happens. Changes get built and tested on a staging copy with your real data, then deployed with a rollback path.
Anything touching payments or checkout gets tested with real transactions in test mode first. That's the area where a mistake costs money immediately rather than eventually.
Usually, and it's one of the most common things we're asked about. It's normally a timing problem: stock syncs on a schedule, and orders arrive between syncs.
The fix depends on what the other system can support. Sometimes it's more frequent syncing, sometimes it's reserving stock at checkout, and sometimes it's a buffer on fast moving lines.
We build so that card details never touch your server, which is what keeps the compliance burden small. Payment fields are handled by the payment provider directly.
Compliance itself is your obligation rather than something an agency can sign off. If you have specific requirements, raise them at scoping since they affect architecture.
Usually, once we've measured where the time actually goes. Store slowness is normally database queries or accumulated third party code, and those need different fixes.
What rarely works is adding another caching layer on top. It hides the symptom on some pages and makes the underlying problem harder to see.
That's a normal arrangement. We take a defined piece of work and they keep everything else, with the boundary agreed before anything starts.
For smaller pieces of functionality outside a store context, that sits under custom web development.
Same team, same process, with the added constraint that everything runs against a live store taking orders. Pricing sits on the main web development page.
Other development services
Thirty minutes on your store, your stack, and what it would take to make them line up.
Or email hello@culmen.digital