Offer 02

Custom development

From the demo that impresses
to software that holds

We build your AI prototypes and your first working versions
so they can genuinely be industrialised, from 3 weeks.

Industrialise my prototype

This is for you if

The prototype does not survive reality

It works in a demo, in front of three people. As soon as real users, real data and security enter the picture, nothing holds.

A spreadsheet has become critical

A spreadsheet or a patched-together tool runs part of your business. Nobody is comfortable, and yet everybody uses it.

The idea is clear, the path is not

You know what the tool should do. You do not know where to start, nor what needs building first.

How we work

What matters is decided on day one

The difference between a demo that impresses and software that holds in production comes down to what goes under the hood from the start: tests, security, documentation, continuous integration.

First working version AI prototypes CI/CD & tests API-first
Industrialise my prototype
  1. 01

    Scope what matters

    The first use case, the real users, the assumptions worth testing. A realistic trajectory from 3 days.

  2. 02

    Build it properly

    Modern architecture, CI/CD, automated tests, security and documentation. No shortcut we would pay for later.

  3. 03

    Deliver a real version

    A first working version, used by real users, from 3 weeks.

  4. 04

    Hand you the keys

    Source code and documentation delivered continuously, with no lock-in. You can take the project back, or keep us.

You end up with a tool you own

A first working version, clean and documented, on which your future developments will start from a sound base.

★ The flagship asset

A working version, actually used

Clean, secure and documented, not a fragile demo. It serves as the base: every later change starts from sound ground, and you can take the keys overnight.

from 3 weeks

The complete package, delivered

  • Source code delivered continuously, with no lock-in
  • CI/CD, automated tests and security built in
  • Complete business and technical documentation
  • A live demo and an evolution plan for what comes next
  • A base ready for what follows, not a technical dead end
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 code, a service framework that secures your projects and keeps you in control of your tools.

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

    You stay in control of your tools

    Source code and documentation delivered continuously, with no lock-in: you stay in the driver's seat and can take back your tools at any time.

  2. 02

    Your security taken seriously

    Practices grounded in the leading frameworks: NIST, ISO 27001, GDPR, NIS2 and DORA, depending on the project context.

    GDN scores 984/1000 in the CyberVadis assessment →
  3. 03

    Your teams build real skills

    Done With You to pass on our know-how, or Done For You to move fast: we support your teams, deliver secure, documented APIs, and share what we know so you become self-sufficient.

  4. 04

    Your project always under control

    A steering framework that secures progress, from scoping to production, with realistic planning and regular check-ins.

  5. 05

    Fast, and well built

    The speed of AI tools, the rigor of senior software engineering: moving fast, with no tech debt or throwaway code.

  6. 06

    Progress you can measure

    We define the right indicators with you, track them, and validate progress to target areas for improvement.

  7. 07

    The AI lever, with the risks kept in check

    Team processes reviewed regularly to secure your deliverables, clarify responsibilities and govern AI usage.

  8. 08

    A team that knows your business

    A full team, trained on your application and ecosystem, that builds on your business knowledge as the project progresses.

  9. 09

    A partner for your critical projects

    A partner for your strategic, critical projects, able to stay engaged over the long term with no break in accountability.

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

A sensitive business application at scale, from secure onboarding to the complete management of an entire network of consultants

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 any service 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

OFIM

Multi-agency real estate, internationally

International
Business software Applied AI

A complete real estate platform, from the public website to automated listing distribution

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

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

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 reference.

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

Show us what you already have

A prototype, a spreadsheet, a mockup or three pages of notes: that is a better starting point than a requirements document.

Industrialise my prototype

See all four offers