For online shops and booking websites.

Ecommerce conversion rate optimisation. Same traffic, more revenue.

More orders from the traffic you already pay for. I find where your shoppers drop off, from the product page to payment.

Get your free auditSee what I work on
SDVVBJVJA

5/5 on Google, 3 reviews

Sébastien Balieu, your personal contact from start to finish.

They trusted me with their website
EuronetNallianTraxxeoRepos ProductionHeat MeVaibesHighcodataCatIDDogIDHR-AlertCawab

Signs of a shop that is losing sales.

A visitor who leaves without buying is a visitor you have already paid for, through ads or search.

  • Visitors add to basket, then abandon

    To test: show the costs from the product page, offer guest checkout and cut the number of payment steps.

  • Customers discover delivery costs at the last minute

    To test: show the delivery price and time before the basket, then test a free delivery threshold.

  • My product pages convert poorly

    To test: put the price, availability and buy button on the first screen, with reviews and guarantees alongside.

  • My mobile visitors buy far less

    To test: rework the mobile journey, from the menu to payment, and offer Apple Pay or Google Pay.

  • My average order value is flat

    To test: suggest complementary products and bundles, and set a free delivery threshold just above your current average basket.

  • I don't know at which step my customers drop off

    To test: track the purchase funnel in Google Analytics (GA4), then watch the sessions that abandon.

Seeing these signs on your shop?

Get your free audit
Case study

Coddy, +31% conversion at the same price.

Coddy, the company I co-founded, sells escape games online in 9 countries. The new version of the site has been live since 1 September 2026.

Over September and October, the conversion rate rose from 0.91% to 1.19% compared with 2025, with the price unchanged at €39.99 per team.

  • +51% paid bookings
  • +56% revenue
  • The price visible from the home page
  • A three-step checkout
Read the full case study
The old Coddy home page
The new Coddy home page, with the price and the audience visible without scrolling
What I work on

Fixes chosen from the audit.

I put in place the fixes for your blockers, in order of their impact on your sales.

  • Funnel tracking

    I set up purchase funnel tracking in GA4, from the product page to the order, so you know at which step your shoppers drop off.

  • Product pages

    The price, availability, reviews, guarantees and buy button on the first screen.

  • Basket and checkout

    Fewer steps, guest checkout, the payment methods people expect and costs shown from the start.

  • Delivery and returns

    Clear delivery times and costs before the basket, and a returns policy that is easy to find.

  • Navigation and search

    Categories, filters and a search that lead to the right product in a few clicks.

  • Average order value

    Complementary products, bundles and a free delivery threshold set to match your baskets.

  • UX/UI

    I redesign the product pages, the basket or the checkout when they get in the way of buying. You approve every Figma mockup before it is built.

  • Automation

    Abandoned basket reminders and post-purchase emails, connected to your shop.

  • Which fix should your shop tackle first? The audit ranks them by expected effect on your sales.

    Get your free audit
Platforms

Every platform, even custom-built.

Purchase blockers come down to buyer psychology. Costs revealed in the basket or a mandatory account hold buyers back in the same way on Shopify, on WooCommerce or on a custom-built shop.

  • Shopify
  • WooCommerce
  • PrestaShop
  • Magento
  • Shopware
  • BigCommerce
  • Odoo
  • Wix
  • Squarespace
  • Webflow
  • Salesforce Commerce Cloud
  • Custom-built
How it works

The same method, applied to your shop.

Five steps, from the first test order on your shop to the monthly sales review.

  1. Step 130 min · free

    The free audit

    I go through your shop as a buyer would, from the home page to payment, on mobile and on desktop. Two working days later, you have around ten purchase blockers, each illustrated with a screenshot and followed by its fix.

  2. Step 21 to 2 weeks

    Measurement first

    I check that every order is counted, with its source, in Google Analytics (GA4), and that every step of the funnel is reported. This starting point is then used to measure every change.

  3. Step 31 meeting

    Priorities

    I rank each improvement by its expected effect on your revenue and the effort it takes. You know which pages come first, and why.

  4. Step 42 to 6 weeks

    Implementation

    Your developer, your ecommerce agency or my partners build the changes, under my direction. When order volume allows, an A/B test validates each change.

  5. Step 5Every month

    Follow-up

    Every month, a review of the work done and its effect on conversion rate, average order value and revenue, compared with the starting point, and the choice of the next pages to work on.

For the audit, your shop's address is all I need.

Start with the free audit
My commitments

You know what to expect.

They apply from the audit of your shop, whether you sign or not.

Before you sign

  • I analyse your shop myself.
  • The audit only needs your shop's address. I work without access to your back office.
  • The audit report is yours, even if you go no further.
  • If the problem lies in your offer, your price or your traffic, I tell you so, and I don't offer you ongoing support.

During the engagement

  • I fix the existing shop first, before any talk of a redesign.
  • You approve the mockups before anything in the shop changes.
  • Every change is compared with the starting figures: conversion rate, average order value and revenue.
  • The review lists the gains as well as the tests that had no effect.
  • I handle your shop myself, from the audit to the last review.

Send your shop's address, the audit is free.

Get your free audit

I sell online myself, in 9 countries.

I was head of digital marketing at Walibi and then at Zetes, founded a web agency in Brussels, then co-founded Coddy, which sells its escape games online in 9 countries.

I know abandoned baskets, shipping costs and promo codes from the inside, and I audit every shop myself.

My background
Sébastien Balieu

Sébastien Balieu

Founder of Numinam, co-founder of Coddy

Get your free audit

  • 20 years

    in digital marketing, since 2006

  • 9 countries

    where Coddy sells its games online

  • +31%

    conversion rate on the Coddy shop since September

  • 48 h

    for the audit of your shop, from home page to payment

5.0 out of 5

3 Google reviews

"Numinam's contribution to the development of our App has been significant in its success…"Stephane Draux, Spengo"Numinam (One More Pixel) is doing a fantastic job for Euronet. They’ve started the…"Valérie Van Belle, Euronet"At Nallian we build solutions that are trusted by the world's leading airports, ground…"Jean Verheyen, Nallian"The new website much better reflects who we are. It tells our story more clearly, it's…"Joke Aerts, Nallian"Numinam's technical and design vision has enabled us to improve our lead generation…"Jérôme Van De Sande, Heat Me"Numinam has completely modernized our website. The design is clearer, more credible, and…"Olivier Lafosse, Heat Me"It was a real pleasure to do business with Sebastien. He did a great job and transform…"Shirley Boterdael, Highcodata
FAQ

Your questions about ecommerce CRO.

The questions online shops ask me most often.

Ecommerce CRO is conversion rate optimisation for an online shop. It means increasing the share of visitors who place an order, with the same traffic. I follow the journey from the home page to payment, fix the blockers in order of impact and measure the effect of each change on your sales.

Allow €2,490 excl. VAT per month at minimum. The audit of your shop is free. Before you commit, you receive a quote that sets out the deliverables, the planned capacity and the terms.

Allow 6 weeks for the first effects, as a rule. That is the time it takes to make order tracking reliable and launch a first piece of work. After that, each monthly review shows how your sales are moving.

With the audit. I look first at delivery costs revealed in the basket, mandatory accounts, product pages and the mobile journey. You receive the list of blockers, ranked by impact on your sales.

Yes. When order volume allows, an A/B test validates each change. Below that, I work from purchase journeys, session recordings and your customers' reviews, and I track the effect of each change month by month.

All of them. Shopify, WooCommerce, PrestaShop, Magento, Shopware, Odoo, Wix, and custom-built shops. Purchase blockers come down to buyer psychology. Costs revealed in the basket or a mandatory account hold buyers back in the same way on every platform.

Not necessarily. I fix the existing shop first, page by page. A redesign makes sense when the platform can no longer evolve.

Yes. Your revenue depends on the number of orders and the average order value. I measure both, along with the conversion rate, at every review.

Not for the audit, your shop's address is enough. For measurement and implementation, we agree together on the access needed to Google Analytics and your shop.

No. I work on the product pages and the pages your campaigns land on. With your agency or your acquisition manager, we track the cost per order.

A jeweller and a car parts seller have different rates, so a market average tells you very little. I compare your shop with itself, before and after each change.

Can't find your question?Ask me directly

Free audit

Find the blockers in your shop.

Send your shop's address. Two working days later, you receive around ten purchase blockers, ranked by their effect on your sales, each with its fix. The report is yours, even if you go no further.

Get your free audit