Offer 01
We combine the power of AI with the rigour of our engineering
to make your existing web applications
reliable, secure and scalable, step by step,
with no big bang and without stopping your business.
Case study
A remote payment solution used at scale, modernised step by step while it kept running.
Interface rethought from mobile to desktop, code partitioned feature by feature, security and permissions centralised in a single entry point. All of it with no big bang and no service interruption, on an application where every payment counts.
every day, thousands of remote payments sent and securedWhat the modernisation changed
The application runs, but every change is frightening. The people who wrote it have left, and the documentation left with them.
Unmaintained versions, ageing dependencies, patches falling behind. A client audit or an incident has put it back on the table.
What used to take two days now takes ten. Technical debt has piled up and is now slowing your business down.
How we work
We start from your reality (the stack, the usage, the debt) and move forward in steps. Your tool stays online while the work happens, and you sign off on each stage before the next one starts.
Application audit, mapping of usage, technical debt and security risks. We know what we are touching before we touch it.
What is urgent, what is important, what can wait. Trade-offs decided together and aligned with your budget.
Version upgrades, targeted refactoring, automated tests, hardening. Your tool stays online while the work happens.
Pragmatic AI integration, living documentation, source code delivered continuously. We keep pace with your business.
Our developers work with AI coding agents: that is what makes us fast. The frame around them is what spares you the throwaway code those tools produce when nobody is watching them.
Supervised code generation, AI-assisted code reviews and documentation, gradual automation of development. We move in small cycles, never in big leaps.
Human in the loop: nothing ships to production because an AI wrote it. A senior developer decides, reviews and owns every release.
Automated tests, static analysis, CI/CD, version and release management. Whatever slips through too fast is caught by the machine before it reaches you.
The goal is not to rewrite everything. It is to make your application safe, understandable and able to evolve again.
Not a hundred-page report, but a readable map of your stack, your risks and your debt, with the work ranked by urgency and costed. Usable even if you then decide to proceed without us.
first findings within a few daysThen, stage after stage
Cybersecurity
984/1000 CyberVadis Platinum medal · Mature level
An objective proof of cybersecurity maturity for your applications, B2B platforms and business-critical digital tools.
Discover our commitmentBeyond development, we make sure the project stays solid, easy to evolve and under your control.
CyberVadis Platinum Medal · 984/1000 Contact our expertsSource code and documentation delivered continuously, with nothing held back and no lock-in. Your teams can take over what we build.
Our developers work with AI coding agents, under human review and within a structured engineering framework: CI/CD, tests, development standards and documentation.
984 out of 1000 in the CyberVadis assessment. On projects: code and dependency analysis at every delivery, automated OWASP tests and OpenVAS scans.
See the details of the CyberVadis assessment →A dedicated team, trained on your application and your ecosystem, that learns your context as the project progresses and records it in maintained documentation.
A clear architecture, development standards and maintained documentation, so your application can evolve without starting from scratch with every new requirement.
Scoping, build, production, maintenance, evolutions and modernisation: GDN stays engaged over the long term, with no break in accountability and a one-year warranty included.
Francofa-Eurodis (Rexel Group)
B2B distribution / e-commerce
From a scattered file-building process to a guided, secure, traceable registration journey, automatically integrated into the ERP.
View the case study
Hightekers Group
Freelancing with all the benefits of employment
InternationalAn end-to-end business system to support rapid growth, industrializing and securing the entire consultant lifecycle, from registration to payroll, and making financial flows reliable at scale.
View the case study
Payboxmail (Verifone Group)
Multichannel remote payment
InternationalFrom a proven application to a modular, robust and secure web application, redesigned from mobile to desktop, where all business data flows through a single, validated, secured path.
View the case study
Francofa-Eurodis (Rexel Group)
B2B distribution / e-commerce
From a commercial relationship carried by phone and branch to an online sales channel that extends the ERP, with each professional client's negotiated pricing.
View the case study
OFIM
Multi-agency real estate, internationally
InternationalFrom a fast-growing network across three territories to a single digital platform that carries the entire real estate business and multiplies the reach of every listing, with no re-entry.
View the case study
Annealsys
B2B - Semiconductor equipment
InternationalFrom a site already central to the sales relationship to a genuine commercial tool: a catalog detailed to an engineer's standard, enquiries that arrive already qualified, and every visitor pointed to the right contact, anywhere in the world.
View the case study
Cordia (Rexel Group)
Fire safety / E-commerce
InternationalFrom a French-only B2B e-commerce site to an internationalized shop, kept continuously up to date with the support of AI, with no new database to administer, preserved SEO and controlled cost.
View the case study
Cordia (Rexel Group)
Fire safety / E-commerce
InternationalFrom order taking carried by direct channels to a complete online workspace, where every professional client finds their pricing, their quotes, their outstanding balance and their invoices.
View the case study
ALMA
Self-propelled grape harvesters
InternationalFrom a rich but demanding parts catalog to a shop that only shows parts compatible with the client's machine, across a worldwide fleet.
View the case study
Francofa-Eurodis (Rexel Group)
B2B distribution / e-commerce
From a proven PrestaShop 1.6 foundation to PrestaShop 9, running on a fully supported version of PHP, with every business customization preserved.
View the case study
Hightekers Group
Freelancing with all the benefits of employment
InternationalFrom a critical process at the heart of the business to a structured, traceable business system, manageable at scale.
View the case study
Payboxmail (Verifone Group)
Multichannel remote payment
InternationalFrom a proven background engine to event-driven, prioritized, fair orchestration that absorbs spikes of massive sends without one merchant penalizing another.
View the case study
Hightekers Group
Freelancing with all the benefits of employment
InternationalFrom a proven monolithic foundation to a domain-oriented architecture, opened up via API and kept under in-house control, without any service interruption.
View the case study
MCB
Parts & accessories for concrete batching plants
A B2B e-commerce platform rethought from the ground up, reliable and well protected, taking over from an end-of-life foundation without losing a single piece of data: a catalog open to search engines, a professional area reserved for approved accounts.
View the case study
Hightekers Group
Freelancing with all the benefits of employment
InternationalFrom an already solid platform to a stronger level of access security, simple to activate and backed by a real safety net, right up to the most sensitive accounts.
View the case study
Francofa-Eurodis (Rexel Group)
B2B distribution / e-commerce
From back office access protected by a password to flexible multi-factor authentication, enforceable on everyone, with no external dependency and without ever locking an administrator out.
View the case study
Cordia (Rexel Group)
Fire safety / E-commerce
InternationalFrom handing out visuals case by case to a self-service retrieval space, governed by client entitlements and mirroring the catalog.
View the case study
Ammonitia
Rental management & wealth advisory
From standalone tools sitting side by side to a shared, centralized, manageable web system, bringing the three business units together around a single repository.
View the case study
CT49
Vehicle inspection centers
From booking appointments by phone to self-service online booking, available around the clock, shared across several centers and open to partner garages.
View the case studyA short audit is enough to know whether your application deserves to be modernised, rewritten, or simply left alone a while longer.
Get my application audited