Build
Custom software development
The application your business runs on, when nothing off the shelf fits.
Custom software is justified when your business has a rule the market's tools ignore — and working around it costs you every day. We have been building this kind of application for sixteen years: healthcare facility management, a multi-agency property platform, e-commerce back offices. What they have in common is not the technology; it is that people use them daily as their actual job, and that they cannot go down.
The method
How we work
- 01
We start from what costs you time
Not from a fifty-page specification. We look at the real work, the spreadsheets going round by email, the manual re-keying — that is where the return is.
- 02
We ship a useful first scope, fast
A version your teams actually use, rather than a mockup they comment on. What you learn from real use cannot be obtained any other way.
- 03
We iterate with the people using it
Short cycles, frequent releases, feedback acted on within the week. A project that disappears for six months always comes back beside the need.
- 04
We test what breaks silently
Calculations, business rules, data formats. A display bug is visible; a wrong amount or a date shifted by two hours is not, and costs far more.
- 05
We stay after delivery
Hosting, monitoring, fixes, new features. A supplier who disappears at handover leaves you with an asset nobody knows how to evolve.
What you get
Deliverables
- check_circleThe application in production, on your domain, with its backups
- check_circleThe source code, in a repository that belongs to you
- check_circleAutomated tests on the business rules, run on every change
- check_circleOperational documentation: how it deploys, where the data lives, who to call
The proof
Where we have done it
Andrée Putman
Since 2025Reissued furniture, interior architecture projects, collaborations: a bilingual site that shows a body of work and sells pieces, without keeping visitors waiting.
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FlatBay
Since 2015Agencies drowning in incomplete files. An assistant that chases missing documents, computes the affordability ratio, and only passes on complete applications.
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Référentiels de données
Since 2024Addresses, public transport, property sales, land registry: four services answering the same questions as paid APIs, built from open public data, running on our servers.
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Gextra
Since 2010Patient referrals, care records, team scheduling, recruitment, billing, mobile apps: a complete business system, sixteen years of rules, thirty sites — and an interface being rebuilt screen by screen without ever stopping the work.
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Gextra AI
Since 2026How a stay is coded determines what the facility is paid. An AI-assisted review flags under-rated severity levels, and the doctor decides.
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Gextra Academy
Since 2026The vendor was cutting off access: courses, materials and assessments would have left with the subscription. Everything was recovered, then put back in service on a platform the organisation owns.
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Pilotage & support IA
Since 2025Requests arrive by email, by WhatsApp, by web form. They are qualified, attached to the right project, and a reply is drafted — a human approves before it is sent.
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Premium Goods
Since 2019An online shop and the internal tool that runs it: stock, orders, suppliers, field work. Modernised progressively, without ever closing.
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Premium Goods — site public
Since 2018Vanilla, flavours, tobacco: the same product is not named the same way in Europe and in the United States. The public site handles that, from the copy through to the form.
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Clinalliance — réservation
Since 2016A centre opens its slots, clients book, pay and get their invoice. The service has been running since 2016 and has followed every version of our stack.
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HAY HuaHin
Since 2024A studio rental in Hua Hin, Thailand. Site rebuilt, hosted, deployed and optimised by us — and it is our own money going into the Google Ads campaigns.
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Pré-admission patient
Since 2025Eight steps, eighty-one fields, identity documents to photograph — completed by patients who are often elderly, or by a relative on their behalf. Here accessibility and clarity are not optional: they decide whether the file ever arrives.
Read the case studyarrow_forwardFrequently asked questions
- Custom or off the shelf?
- Off the shelf first, genuinely. If an existing tool covers 90% of your need, buying and adapting it is cheaper. Custom is justified when the core of your business is precisely what those tools do not do — or when per-user subscriptions end up costing more than the development.
- Who owns the code?
- You do. The repository is handed over, and you can give the work to someone else. That is also in our interest: a client held in place by technical lock-in is not a satisfied client.
- How long for a first version?
- A few weeks for a useful scope, a few months for a tool that genuinely replaces what exists. We would rather announce a short first milestone and hit it than a distant date nobody ever hits.
Also in “Build”
Website design and rebuild
A fast site that says what you do, and makes people want to call.
smart_toyAI and process automation
We identify what AI can genuinely absorb in your business, and take it all the way to production.
move_upLegacy migration and code takeover
An application nobody dares touch any more, brought back into shape without stopping the business.
smartphoneMobile applications
One codebase for iOS and Android, published on both stores.
hubIntegrations and business APIs
Getting your tools to talk to each other, so nobody re-keys the same data twice.
monitoringData and dashboards
The right figure, in one place for everyone, updated on its own.
Let's talk about your project
Thirty minutes is enough to tell whether we are the right fit. We reply within 48 hours, and we say no when it is not for us.