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Ecommerce Development

Ecommerce development across Europe: platform-agnostic store builds, migrations and checkout engineering, security-reviewed in-house. Free quote.

Manual, expert-ledEvidence-based findingsFree remediation retest

Ecommerce development is the engineering behind selling online well: the checkout that does not lose carts, the catalogue that stays fast at ten thousand SKUs, the integrations that keep stock honest. We build and improve online stores for merchants across Europe, on the platform that actually fits the business, and every store is reviewed by our in-house security team before a customer ever hits the pay button.

A word on who we are. SafetyBis is a European cybersecurity firm, and the development practice you are reading about runs alongside the penetration testing side as a separate team. That is deliberate. When you take card details and personal data, the store is a target from day one, and having developers who were trained by people that attack payment flows for a living changes what gets built. The two practices are contracted and priced separately; the shared knowledge comes free.

What ecommerce development covers

Selling online is not one problem, it is a stack of them: merchandising, checkout, payments, tax, shipping, fulfilment, and the reporting that tells you what is working. Ecommerce development is the discipline of making all of that hold together under real traffic. A store that looks fine in a demo can still lose a third of its checkouts to a slow payment step nobody tested at scale.

Checkout engineering that reduces abandonment and handles failed payments gracefully
Platform selection across Magento, WooCommerce, Shopify and custom builds
Headless and composable commerce where the catalogue justifies it
Payment, tax and shipping integrations tied to your real fulfilment
Catalogue and search performance at thousands of products
Subscriptions, B2B pricing, multi-currency and multi-region selling
ERP, PIM and warehouse connections that keep stock and orders in sync

Choosing the right platform

Half of a good ecommerce development agency’s value is talking you out of the wrong platform. There is no universally correct answer, only the one that fits your catalogue size, your team, your margins and your growth plan. We are platform-agnostic and paid to be honest, not to resell one vendor.

When an off-the-shelf platform is right

For most merchants, WooCommerce or Shopify or Magento does the job and gets you selling faster than a custom build ever could. The skill is configuring it well and extending it carefully rather than drowning it in plugins. We will happily tell you that you do not need custom development if you do not.

When headless or custom earns its cost

Once you have unusual business logic, a very large catalogue, or a front end that needs to be blisteringly fast across several markets, a headless or composable approach starts to pay for itself. We build these where the numbers support it, and we are equally quick to say when they are expensive over-engineering for a store with two hundred products.

Migrating between platforms

Moving a store is a real project, not an export and import. Catalogue, customers, order history and SEO URLs all have to arrive intact or you lose rankings and log people out. We plan migrations so that revenue and search visibility survive the move.

Fixed
milestone pricing agreed before we start
PSD2
3-D Secure and SCA-compliant checkout flows
In-house
security review of checkout and account areas

Checkout and conversion, engineered

The checkout is where money is won and lost, so we treat it as a first-class engineering problem rather than a page to decorate. Small technical decisions have outsized revenue effects: how you handle a declined card, whether the address step reloads the whole page, how fast the payment iframe loads on a mid-range phone on 4G.

Reducing abandonment

We shorten the path to pay, keep guest checkout available, validate inputs without punishing typos, and make failure states clear so a shopper whose card bounces tries again instead of leaving. These are measurable changes, and we measure them.

Payments that fit European reality

European checkout means strong customer authentication under PSD2, 3-D Secure done in a way that does not scare customers off, and the local payment methods your market actually uses. We integrate Adyen, Stripe, PayPal and regional acquirers, and our dedicated payment gateway integration page goes deeper on the card-handling and PCI-scope side.

How an ecommerce build runs

We work in short, visible stages with a deliverable at the end of each, so you are never staring at a blank progress bar wondering what your money bought. The store takes shape on a staging environment you can click through and comment on well before it goes live.

Discovery and scoping

We map your catalogue, your fulfilment process, your payment and tax rules, and the systems the store has to talk to. That inventory is where the honest cost of the project lives. You leave discovery with a written scope and fixed milestones you can hold us to.

Build and integrate

Development happens in increments on staging. We build the catalogue and checkout first, wire in payments against real sandboxes, then connect the back-office systems one at a time so each connection can be tested on its own rather than in a big-bang launch.

Test, launch, watch

Before go-live the store goes through functional QA on real devices, a load test if you expect seasonal spikes, and a security pass over the checkout and account areas. After launch we watch the first days closely, because that is when real traffic finds the edge cases a test plan misses.

Get a fixed quote

Want this tested on your own systems?

Free 20-minute scoping call, a fixed price with no hourly surprises, and a free retest once you fix what we find.

Get a fixed quote

B2B, subscriptions and selling across borders

Not every store is a simple cart-and-card shop. A good deal of our work involves the harder commerce models, and those are where an experienced ecommerce development company saves you from expensive mistakes.

B2B and account-based pricing

Trade customers expect negotiated prices, credit terms, quote requests and bulk ordering. We build those without turning your storefront into two separate systems bolted together, so consumers and business buyers share one clean codebase.

Subscriptions and recurring revenue

Recurring billing is deceptively hard: failed renewals, card updates, proration and dunning all have to work quietly in the background. We build subscription flows that recover failed payments instead of silently losing the customer.

Multi-currency and multi-region

Selling across Europe means multiple currencies, correct cross-border VAT, and content in more than one language. We set the store up so a new market is a configuration, not a rebuild.

Security in commerce is not optional

Every online store is a standing target because it processes payments and holds personal data. This is exactly the ground our other team works on, so ecommerce development at SafetyBis bakes in the defences that matter. Card data stays out of scope where a hosted payment field can carry it. Customer accounts get authorisation checks that verify ownership, not just a valid login. Admin access is scoped and logged.

Card data and PCI scope

We design so that the sensitive card entry happens in the provider’s iframe or hosted page, which keeps your PCI scope small and your risk low. That single architectural choice removes a whole category of breach and a great deal of compliance burden.

The formal test, if you need it

When an acquirer or an enterprise partner wants evidence, our offensive security team runs a full penetration test against the live store and produces a report and an attestation letter aligned to PCI DSS. That is a separate, security-side engagement with its own quote, and buying the development does not commit you to it.

The systems behind the storefront

A store that cannot see your stock or push orders to fulfilment is a liability dressed as a website. We connect the storefront to the systems that run the business, and we build those connections to fail safely.

Stock, orders and the ERP

Inventory sync, order push and price updates get built as their own components with clear boundaries, so a platform upgrade does not silently break the overnight stock feed. If the ERP is unreachable, orders still capture and queue rather than disappear.

Marketing, analytics and tax

We wire in analytics that respect consent, tax engines that handle cross-border VAT correctly, and the marketing tools you use, without loading the front end down with a dozen slow third-party scripts that wreck your Core Web Vitals.

Ecommerce development pricing

Commerce projects are scoped, never sold off a rate card, because the cost sits in the checkout logic, the integrations and the catalogue complexity, not a page count. We do not publish day-rates for project work. You get a real number from the discovery stage, quoted against fixed milestones.

Project type What’s included Typical timeline Pricing
Store audit and roadmap Review of an existing store’s code, performance, checkout and integrations, with a prioritised improvement plan 1–2 weeks project-scoped, from a free quote
New store build A commerce build on the right platform for you: catalogue, checkout, payments, launch support 6–12 weeks project-scoped, from a free quote
Platform migration Move between platforms with catalogue, customers, orders and SEO URLs preserved 6–12 weeks project-scoped, from a free quote
Headless / composable build A decoupled front end over a commerce back end, for large catalogues or multi-market speed 3–6 months project-scoped, from a free quote
Checkout and conversion work Focused engineering on the payment path, abandonment and performance, with before-and-after measurement 2–5 weeks project-scoped, from a free quote
Large or multi-region estate Multiple stores, currencies and warehouses, scoped after a discovery workshop on scoping project-scoped, from a free quote

Every project is fixed against agreed milestones and quoted after a free scoping call, under NDA, for merchants anywhere in Europe. Scope my project

What you get

A store you own

You keep the code, the configuration and the documentation, with no proprietary layer you have to keep paying to touch. If you switch teams later, the next developers can read what we built.

A clean handover

At launch you get documentation of the integrations, the deployment and the catalogue setup, plus the maintenance points to watch. Whether your team runs it or we stay on, nothing lives only in one person’s head.

FAQ

How much does ecommerce development cost?
Ecommerce development cost depends on the platform, the checkout and integration complexity, and whether it is a new build or an improvement, so there is no fixed price. You get a milestone-based quote after a free scoping call, with no open-ended hourly billing.
Which platform should I sell on?
Whichever fits your catalogue, team and margins. As a platform-agnostic ecommerce development agency we work across Magento, WooCommerce, Shopify and custom builds, and part of the scoping call is honestly telling you which one you actually need.
Do I need a headless or custom store?
Usually not, and we will say so. Headless and composable commerce earns its cost for large catalogues, unusual business logic or multi-market speed, and it is expensive over-engineering for a small store. We recommend based on your numbers, not a trend.
Will my checkout meet PSD2 and PCI requirements?
Yes. We build strong customer authentication and 3-D Secure into the checkout, and design so card entry stays in the provider’s hosted field, which keeps your PCI scope small. A formal PCI-aligned penetration test is available as a separate engagement.
Can you migrate my store without losing SEO?
Yes. We plan migrations so catalogue, customers, order history and SEO URLs arrive intact, with redirects in place, so search rankings and customer logins survive the move rather than resetting to zero.
How do you keep stock and orders in sync with my ERP?
We build inventory and order integrations as their own components that fail safely, so a platform upgrade does not break the stock feed and orders queue rather than vanish if the ERP is briefly unreachable.
Is the store secure against attacks?
Security is a separate practice at SafetyBis, but your store is built by developers trained by penetration testers, so the common commerce flaws are designed out and every checkout and account area gets an in-house review before launch.
Do you work under NDA across Europe?
Yes. Every engagement runs under NDA signed before code or credentials are shared, and we build for merchants throughout Europe, on-site or fully remote.

Related services

Who needs this

Merchants who want the engineering behind selling online done properly: a new store on the right platform, a migration that keeps its SEO, a faster and more reliable checkout, or a commerce partner who treats a payment-handling store as the security target it is.

why safetybis

Security you can prove

The same standard on every engagement, big or small.

Evidence, not opinions

Every finding ships with a reproduction and proof of concept — no vague "maybe vulnerable".

Humans over scanners

Certified engineers find the logic flaws and chained attacks automated tools walk straight past.

Fixed price, free retest

You know the cost up front, and verifying the fix is part of the deal — not a second invoice.

500+
assessments delivered
<30min
incident first response
12k+
infections removed
98%
fixed within one retest
$ safetybis quote --service "Ecommerce Development"

Ready to lock this down?

Free scoping call, fixed price, free retest. Tell us what you're running and we'll take it from there — usually within one business day.

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Tell us what you're running

Scoping is free. We reply within one business day, and under 30 minutes for active incidents.