E-commerce website development
Custom shop features and integrations built on your platform: product configurators, ERP sync, custom checkout logic.
GradaxEuropean companyOrder outright
Founded 2014·Built and operated in Europe·1 to 6 weeks
About this service
Most shops reach a point where the theme and app store stop being enough. You need a product configurator, a B2B price list, a stock sync with your warehouse system, or checkout rules nobody sells as a plugin. We build those features on Shopify, WooCommerce or a headless setup, in a way that survives platform updates.
When a shop outgrows its apps
A typical growing shop runs on a stack of apps: one for product options, one for B2B pricing, one for bundles, one for subscriptions, one syncing stock with the warehouse. Each costs a monthly fee, each adds scripts to the storefront, and they were never designed to work together. Eventually two of them conflict at checkout, and nobody can say which.
A custom build replaces several of those with one piece of code that does exactly what your business needs. It is not always the right call. If an app does the job well and costs 20 euros a month, building it yourself makes no sense. But when apps conflict, when no app quite fits, or when fees across several apps exceed what a build would cost over two years, custom development pays for itself.
Integrations that fail loudly
The most expensive kind of integration bug is a silent one. A stock sync fails at 2am, nobody notices, and the shop sells items the warehouse does not have. An order fails to reach the ERP and is never shipped. These failures are rarely caused by bad code alone; they come from integrations built without considering what happens when the other system is slow or down.
We build every integration to retry failed calls, log what it did, and alert a named person when something cannot be resolved automatically. The specification we agree before building includes these failure cases explicitly, because they are where most of the real-world effort goes.
- What happens if the other system does not respond
- What happens if data arrives in an unexpected format
- Who is alerted, how, and how quickly
- How a failed sync is replayed once the problem is fixed
What you get
Everything below is in the price. Nothing here is an upgrade.
- Technical specification approved before build
- Feature or integration built and deployed
- Code in a repository you own
- Test record and technical documentation
What changes
- The custom feature working on your live store, tested with real orders
- Code kept in version control and documented, not hidden in theme files
- Integrations that retry and alert on failure, rather than silently dropping orders
- No new monthly app fees where a one-off build does the job
How it runs
Specify
Behaviour, edge cases and failure handling written down and agreed.
Build
Developed on a development store or staging, in version control.
Test
Real-world orders and edge cases run through before release.
Release
Deployed with a rollback plan and documented for your team.
Compare the sizes
The standard price for each size. Extras are priced beside it, not hidden behind a call.
| Included | Small feature€3501 week | Feature or integration€6902 to 3 weeks | Complex build€1,4504 to 6 weeks |
|---|---|---|---|
| Specification | Included | Included | Included |
| One small feature built | Included | Included | Included |
| Tested on staging and live | Included | Included | Included |
| Documentation | Included | Included | Included |
| One integration with an outside system | Not included | Included | Included |
| Error alerts and retry handling | Not included | Included | Included |
| Code repository handed over | Not included | Included | Included |
| Up to three connected features | Not included | Not included | Included |
| Automated tests for critical paths | Not included | Not included | Included |
| Load testing for high-traffic periods | Not included | Not included | Included |
| 30 days of support | Not included | Not included | Included |
| Order | Select | Select | Select |
Add what you need
Choose the size
Add what you need
Your total€690
ContinueThe standard price, plus whatever you add. Confirmed in writing before anything starts; nothing is charged until you accept it.
Questions
Which platforms do you develop for?
Shopify, including apps and checkout extensions, WooCommerce, BigCommerce and headless builds with Next.js. Magento work has its own offer.
Why not use an app?
Often an app is the right answer, and we will say so. A custom build makes sense when no app fits, when several apps conflict, or when the monthly fees add up to more than a one-off build.
Who owns the code?
You do. It is delivered in a repository under your account.
Related searches
Related work
ScopedSystem integrationTwo systems that do not talk to each other, made to.from €1,800on scope
One-timeMagento store developmentFixes, extensions, theme changes and upgrades on Magento 2 and Adobe Commerce stores.from €290one-time
One-timeE-commerce website designShop pages designed in Figma around how people browse, compare and check out, ready for any developer.from €420one-time
Order it
Standardised enough to order on its own. The price is confirmed in writing before anything starts.