Custom software engineering, from scoping to production, for SMEs, mid-caps and scale-ups

Fast, but properly built.
And built to last.

We combine the power of AI with the rigor of our engineering to turn your ideas, prototypes and existing software into web applications that are reliable, secure and scalable.

Scoping from 3 days First operational version from 2 weeks Code and documentation delivered continuously Support for the long run

Talk to an expert about my project

Understand the GDN method

What's your situation today?

Starter

You've spotted an AI opportunity, a business need, or you already have an AI demo, but you're not sure where to start.

We analyze the problem, challenge the first leads and define the right tests to turn intuition into a realistic project and real value, in just a few days.

  • First concrete tests from 3 days
  • Scoping and choice of your first use case
  • Proof of concept or pilot project, depending on how mature the project is
Scope my project

Industrializer

You have a prototype, a no-code tool, or an AI experiment that works as a demo, not in production.

We consolidate, secure, document and industrialize it to deliver a usable pilot version.

  • Audit of the prototype and its foundation
  • Industrialization: CI/CD, testing, security
  • Going live, with ongoing support
Audit my project

Modernizer

Your business software is aging: technical debt, fragile security, limited scalability.

We audit, modernize step by step and integrate AI, without a big bang, with a partner who stays for the long run.

  • Application audit and technical debt reduction
  • Progressive modernization, without a big bang
  • Security hardening and pragmatic AI integration
Modernize my software

The GDN method

From intuition to value, then to lasting software in just a few weeks

1
   Scope

The short step that saves you the long detours

Clarify, test, then decide what's next
from 3 days

Scoping turns an intuition, an idea, a business need or a vibe-coded prototype into a realistic path forward: what to test, what to build, what's better avoided, and a clear roadmap for what comes next.

Learn more Your deliverables

2
   Launch

Deliver the tool that matters, fast

Your first usable, secure operational version, from 2 weeks.

Your validated concept becomes a first operational version, usable by real users: CI/CD, automated testing, security, business and technical documentation, source code delivered continuously.

Learn more Your deliverables

3
   Operate

Maintain, secure, and evolve

Your software in production, within a scalable, secure and reliable ecosystem

We maintain, modernize and evolve your critical software, starting from your pilot or your existing systems : CI/CD, automated testing, security, business and technical documentation and continuously delivered source code, AI integration.

Learn more Your deliverables
Discover what sets us apart
CyberVadis Platinum medal awarded to GDN with a score of 984 out of 1000

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 commitment

What sets us apart

Beyond development, we make sure the project stays solid, easy to evolve and under your control.

CyberVadis Platinum Medal · 984/1000 Contact our experts
  1. 01

    You stay in control of your tools

    Source code and documentation delivered continuously, with nothing held back and no lock-in. Your teams can take over what we build.

  2. 02

    Fast, and well built

    Our developers work with AI coding agents, under human review and within a structured engineering framework: CI/CD, tests, development standards and documentation.

  3. 03

    Security at the core

    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 →
  4. 04

    A team that builds on your business knowledge

    A dedicated team, trained on your application and your ecosystem, that learns your context as the project progresses and records it in maintained documentation.

  5. 05

    Your tools stay easy to evolve

    A clear architecture, development standards and maintained documentation, so your application can evolve without starting from scratch with every new requirement.

  6. 06

    Continuous accountability

    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.

They trusted us with their projects

Francofa-Eurodis (Rexel Group)

B2B distribution / e-commerce

Business software Digitization

Application for digitizing B2B client registrations

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

International
Business software Industrialization

Managing an entire consultant network, from secure onboarding to payroll

An 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

International
Modernization Security

Modernizing a critical payment application, without interruption

From 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

B2B e-commerce ERP integration

B2B e-commerce platform and client self-service, backed by the ERP

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

International
Business software Applied AI

A real estate platform, from public site to automated listings

From 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

International
Bespoke website Lead generation

A bespoke website, from technical catalog to lead generation

From 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

International
Applied AI B2B e-commerce

Continuously internationalizing a B2B e-commerce site

From 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

International
B2B e-commerce ERP integration

B2B e-commerce platform and client workspace, backed by the ERP

From 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

International
B2B e-commerce Business software

Filtering spare parts by machine serial number

From 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

E-commerce PrestaShop

Upgrading a heavily customized platform from PrestaShop 1.6 to 9+

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

International
Business software Automation

Complete travel expense management tool

From 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

International
Architecture Robustness

Orchestrating bulk sends, fair and resilient at scale

From 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

International
Modernization API First

Modernizing the legacy system toward an API-First architecture

From 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

B2B e-commerce Modernization

Turning an end-of-life B2B e-commerce platform into a modern, secure store

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

International
Security Authentication

Integrating two-factor authentication (2FA) via a mobile app

From 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

Security Authentication

Adjustable multi-factor authentication

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

International
Business software B2B self-service

Self-service B2B media library module

From 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

Business software Modernization

Modernizing the Investors Department's business application

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

Business software Online booking

Online vehicle inspection booking platform, multi-center and multi-actor

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 study

Frequently asked questions

We're here to answer your questions about our method,
our offers and the way we work with your teams.

It all starts with the Scope step, from 3 days, whether you're starting from a blank page or from a demo already built with AI. Experts who have seen hundreds of projects analyze your need, challenge the options and define the tests that matter. You leave with a realistic roadmap and a clear decision: proof of concept, pilot or re-scoping.

The pilot from the Launch step is your first usable, operational version (MVP), delivered from 2 weeks. Not a demo: a clean, secure and documented tool, industrialized from day one with continuous integration and deployment (CI/CD), automated tests and staging. You deliver value in the field, with real users, and you get real feedback in real conditions for what comes next.

You get a senior team that masters every dimension of a project: technical, business, organizational, security and industrialization. More than 20 years of experience, 25,000 hours of engineering and development per year, professional technical resources that are immediately operational. The speed of an AI studio, the rigor of senior software engineering.

We've practiced AI daily for more than 4 years, across every stage of the software lifecycle, with one simple rule: AI proposes, our senior engineers and developers decide and take responsibility. Code reviews, automated tests, continuous integration and deployment (CI/CD) and continuous documentation frame every delivery. That's what sets production software apart from a fragile demo.

Both, with a flexible boundary. In "With you" mode, we build together and pass on methods, tools and AI culture. In "For you" mode, we take charge of delivery to move fast. In both cases, your teams build skills and stay in control.

Yes. We don't do lock-in; on the contrary, it's at the heart of our philosophy. The source code is delivered continuously to your git, along with business and technical documentation, also continuously. You keep control of your tools, your data and your decisions. Your teams can take over the project at any time. Usually, our clients keep us alongside them for maintenance and evolution, but that's their choice.

No, in three cases out of four. Generally, we audit what exists and then modernize progressively, without a big bang: reducing technical debt, hardening security, interconnections, pragmatic integration of AI. You keep a tool that works while it evolves, with a partner that supports its clients over several years. In some cases it's more cost-effective to rebuild, and if that's the case you'll know after the audit.

Security is built into the way we work, from design to production. On every delivery, our pipeline automatically analyzes the source code and dependencies, and runs security tests. This maturity is recognized by the CyberVadis Platinum medal, with a score of 984/1000. Learn more about our CyberVadis Platinum medal.