Custom Business Application Development | Micro-Applications & APIs

Design, development and maintenance of applications

Code, low code, no code, APIs, generative AI

Transform your ideas into personalized and 100% scalable web solutions for your clients, teams, and partners.

Discover how our experts can help you imagine, design, plan and progressively create custom web applications that meet your specific needs and offer you daily support in collaboration with your teams.

Free strategic session (30 minutes)

Applications and interconnections to create immediate, incremental and sustainable value.

Business web applications and micro-applications are 100% personalized tools, designed to address your company's specific challenges and integrate seamlessly with your existing ecosystem.

Our approach? Pragmatic and agile. We analyze your real needs, weigh the appropriate technologies and always prioritize the solution that moves you forward quickly. Test, adjust, evolve: your tools grow at the speed of your ambitions.

Each project automates your repetitive tasks, centralizes your critical data and streamlines collaboration between teams. The result? Value created at all levels: more efficient employees, better served clients, better integrated partners.

Measurable ROI from the first weeks of use.

Micro-applications and APIs

Flexible, targeted and quick to deploy, micro-applications are autonomous web modules designed to automate a task, streamline a process or connect your business tools together.

Integrated with your existing systems (CRM, ERP, databases…) and often decentralized in the cloud, they allow you to accelerate onboarding, simplify collaboration, create personalized dashboards or build efficient internal assistants.

Thanks to APIs (REST, SQL, NoSQL) and custom interfaces, GDN designs micro-applications that integrate perfectly with your organization, to save you time, value and clarity in your operations.

Business applications

Applications are a cross-functional integration of several micro-applications connected to each other and with your ecosystem, with the aim of offering more complete and feature-rich tools.

We design robust, secure business tools that are perfectly integrated with your current ecosystem. Each application is designed to meet your priority objectives, match your business practices, streamline your operations and save time for your teams.

They allow you to automate tasks, centralize data, facilitate collaboration between teams, and efficiently respond to the needs of your ecosystem — Sales team, HR, logistics, customer service, your clients, partners by bringing business value at every level.

Our solutions are scalable, modular and designed to last — without compromising on performance or security.

Project examples

A custom activity platform, designed for your business challenges

For an international EOR consultant management company, we designed a complete, modular and scalable web application, designed hand in hand with field teams.
On the program: personalized onboarding workflow, fine management of clients and their accounts, activity reports, mission cycle tracking, automated billing, custom document management, interactive client area, mission exchange, and much more.
Each module integrates seamlessly with existing tools (ERP, CRM, identity or electronic signature solutions) and automates what can be automated to free up time and value.
Our approach: start from real business needs to build a robust, responsive solution that is perfectly aligned with internal processes as well as field requirements.

Smooth, secure and 100% integrated digital onboarding

Imagine a smooth and professional registration interface, designed to guide your users step by step, across multiple screens, with clear steps, automated controls and real-time interactions with your business tools.

At GDN, we design custom onboarding journeys: ergonomic multi-step form, identity verification via third-party services, administration interface for monitoring and validation, configurable progress workflow, automation of post-registration actions (creation of entities in ERP or CRM, document generation, notifications, etc.).

Your onboarding no longer just collects data: it becomes a lever for efficiency, brand image and direct integration into your business processes.

Custom development and integrations to increase, simplify and enhance reliability of your B2B e-commerce site

GDN connects your e-commerce platform to your business repositories to automate the import, synchronization and distribution of your product catalogs, documents and media on your e-commerce sites.

Thanks to custom intelligent connectors (FTP, XML, API…), we enable you to centralize data from your PIMs, enhance the reliability of updates without touching sensitive data (stock, prices) and automate multi-site distribution.

Result: an always up-to-date catalog, delegated management without loss of control, and major operational time savings for your teams.

What if you could update thousands of product sheets every night, without additional effort?

20 concrete project examples

A complete service offer around your business web applications

Developing a high-performance application is just the beginning. GDN supports you throughout the value chain: ancillary tools, cloud infrastructure, security, scalability, support… We build a solid digital ecosystem, adapted to your company and designed to last.

Custom complementary tools

Addition of specific modules to enrich your main application.
Seamless integration with your business environment (API, ERP, CRM, etc.).

Scalable cloud deployment

Hosting on secure virtual servers (AWS, OVH, Scaleway…).
Architecture designed to absorb scaling and activity peaks.

Scalability and updates

Regular updates according to your functional or regulatory priorities.
Modular architecture to easily add new components.

Project support and proactive support

A dedicated project manager, available and listening to your teams.
Continuous monitoring with regular meetings to manage priorities.
Responsive technical support for corrective and evolving maintenance.
Project management tools adapted to your internal methods.

Workflow adapted to your organization

Work process aligned with your teams and internal tools.
Collaborative mode to ensure adoption and operational fluidity.

Security and compliance

Implementation of robust protocols to protect your critical data.
Regular security monitoring and updates to anticipate threats.

Guaranteed quality & rigorous processes

A proper functioning guarantee is offered according to the collaboration mode (up to 6 months on fixed-price projects).
A 6-step quality approach, from scoping to production deployment.
Developer tests, cross-reviews, technical validation and final control before delivery.
Complete documentation delivered with each major version.

Prevention and business continuity plan (BCP)

Regular, remote and fragmented backups to ensure data security.
Implementation of a BCP adapted to your infrastructure (cloud, dedicated server, bare metal…).
Architecture designed to limit failure points and facilitate business recovery.
Personalized advice to balance performance, availability and budget.

FAQ - Web application redesign and migration

We answer the most common questions about how we work, our service level and the guarantees we offer.

We deploy your applications on infrastructures adapted to your needs and constraints: public cloud (AWS, OVHcloud, Scaleway), dedicated servers or hybrid architectures. We help you choose the best option according to your budget, expected performance and security requirements.

We apply security protocols adapted to each project: access management, digital safe, sensitive data encryption, application firewall, logging, security updates. Audits can be performed on request or before sensitive deployments.

Our quality approach is based on a 6-step process: scoping, specifications, developer testing, cross-reviews, technical validation and final test before production deployment. This process is applied to each evolution or major delivery.

We offer a proper functioning guarantee for projects carried out on a fixed-price basis, generally for a period of 6 months. For projects in time and materials mode (continuous and agile collaboration), we ensure responsive monitoring and evolving maintenance according to your real needs.

We implement a business continuity plan (BCP) adapted to your architecture. Our backups are remote, regular and fragmented to ensure fast and reliable restoration. The approach depends on the chosen environment (cloud or dedicated).

A dedicated project manager accompanies you throughout the project. They organize follow-up meetings, coordinate technical teams, adapt priorities and ensure proper progress of the schedule. You also have access to a shared monitoring tool.

Web application redesign and migration