Services/S/02/Custom ecommerce

Commerce that converts and survives peak.

Storefronts and checkout flows built for the day traffic spikes and the catalogue stops being small. Headless when it earns its weight, integrated with the systems that keep stock, price and tax honest — and engineered so the buy button never blinks.

Timeline6–20 weeks
Team size2–5
EngagementFixed scope
OutputLive storefront
01 — Overview

Conversion is an engineering metric.

A storefront is only as good as its worst moment. The slow product page, the checkout that drops on a flaky network, the price that disagrees with the invoice. We treat conversion as something you measure and engineer, not something you hope the design buys you.

An engagement starts by following the money: the real funnel, the real drop-offs, the real cost of a 400ms regression on a launch day. We map where the platform you have fights the sale, then propose a build — usually headless storefront over a commerce core, sometimes a focused rebuild of just the checkout.

We hand over a storefront that holds: load-tested through your worst expected peak, observable down to the failed payment, and structured so your team can ship a campaign without filing a ticket with us. Or we stay for the next peak. Both are fine.

02 — Process

Funnel, model, build, peak.

Four phases tied together by one number: revenue that completes, not carts that start.

i.

Funnel

We instrument and read the real funnel — where it leaks, what it costs, and which fixes are worth the build. An honest baseline before anyone touches the cart.

Funnel auditBaselineRoadmap
ii.

Model

Catalogue, pricing, promotions, tax and inventory as a data model that survives a Black Friday and a finance audit. The boring part that decides everything later.

Catalogue modelPricing rulesAPI spec
iii.

Build

Headless storefront and a checkout that degrades gracefully on a bad network. Payments, fulfilment and ERP wired in, observability written alongside the code.

StorefrontCheckoutIntegrations
iv.

Peak

Load-tested to your worst expected day, with a runbook for the one beyond it. We're online for the launch, not just the kickoff.

Load testsRunbooksLaunch support
03 — Capabilities

What we actually do.

The parts of commerce that decide whether the sale completes.

/01

Headless & composable storefronts

Custom storefronts over a commerce core — fast product pages, sane previews, content the marketing team can ship without us.

/02

Checkout engineering

The highest-stakes 200 lines on the site. Resilient, fast, recoverable on a dropped connection, and instrumented to the failed payment.

/03

Payments & tax

Stripe, Adyen and the long tail of methods. Tax, currency and invoicing that agree with finance at the end of the quarter.

/04

Catalogue, pricing & promotions

Price books, bundles, segmented promotions and the edge cases that quietly cost margin if the model is wrong.

/05

ERP, OMS & inventory

Stock that's true across channels, orders that flow to fulfilment, returns that don't strand money. The unglamorous backbone.

/06

Peak readiness

Load modelling, caching, graceful degradation and a launch-day runbook. The site stays up when the campaign works.

04 — Stack

Tools we keep returning to.

Composable where it pays, boring where it counts. The checkout is not where you experiment.

Storefront
Next.js · React
TypeScript · Tailwind
Commerce
Medusa · Commercetools
Shopify (headless)
Payments
Stripe · Adyen
Tax · 3-D Secure
Backbone
PostgreSQL · Redis
ERP · OMS
05 — Selected work

Recent commerce builds.

Numbers we're allowed to share. The rest are under NDA.

Retail · 2025

Headless replatform

Moved a slow monolith storefront to a headless build over the same commerce core. LCP from 4.1s to 1.3s; mobile conversion up 31%.

Hospitality · 2025

Add-ons that sold

A custom upsell and ancillaries flow for a resort group's booking funnel. Attach rate up 2.1×, with no extra step in the path to pay.

Peak · 2024

A launch that stayed up

Re-engineered checkout and caching before a campaign that did 18× normal traffic. Zero checkout downtime, p95 under 700ms throughout.

D2C · 2023

Promotions, finally correct

Rebuilt a pricing and promotions engine that had been quietly leaking margin. Discount logic auditable, reconciliation clean.

Start

Got a storefront
leaving money behind?

Tell us a little about what you're selling and where it's leaking. We reply within two working days, in plain language, with an honest read on whether we're the right team.

AgencyPlateon 55, 104 35
Athens, Greece
Write to us