Custom business software — designed for your company by IT Systèmes

IT Systèmes designs custom business software tailored to your needs: ERP, CRM, EDM, and portals. AI-powered rapid development and integration with your existing IT systems. From concept to launch in 2 to 4 months.

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Industry-specific software designed for your sector

Chartered accountant

Accounting software, client file management, integration with Cegid, My Unisoft, or Pennylane, AI-powered data entry automation (OCR + NLP), and a secure client portal. We have assisted firms with their migration from Cegid to My Unisoft and the development of custom productivity tools.

Lawyers / Legal

Case and document management, tracking time spent per case, fee billing, CARPA and CNB compliance, and AI-assisted legal research in your case law database. Integration with your accounting software and document management system.

Architect

Project management and site supervision, progress and status tracking, workload planning by employee, progress-based billing, and integration with your CAD/BIM tools. Software that adapts to your workflows—not the other way around.

Industry

Production monitoring (MES), inventory and procurement management, traceability, AI-powered predictive maintenance, integration with your ERP (Sage, SAP, Cegid) and your IoT devices. Real-time Power BI dashboards.

Local Governments and the Public Sector

Digitization of citizen requests, e-service portals, meeting management, internal approval workflows, GDPR compliance, and digital accessibility (RGAA). Software hosted in France.

Service and consulting firms

Assignment and project management, staffing, time tracking and billing, employee portal, integrated CRM, automated reporting. Integrated with your Microsoft 365 and accounting software.

Our turnkey solutions: From micro-tools to full-scale ERP systems

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‍Micro-Tool (under €10,000, under 10 days): Replaces Excel, Access, small specialized software, or manual tasks. A tool tailored to a specific need, featuring a modern web interface, built-in AI, and integration with your existing software.‍
Custom CRM (under €50,000, under 50 days): Replace Salesforce, HubSpot, Dynamics, and Sellsy. 100% tailored sales process, integrated AI to automate lead generation, real-time custom dashboards, and full system integration.‍
ERP / Core Business (under €100,000, under 100 days): Replace Odoo, SAP, Oracle, and Cegid. Comprehensive management (CRM, purchasing, inventory, invoicing, time tracking), AI integrated across all business data, and customizable dashboards.

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All plans include: unlimited users, 100% ownership of the code, free data migration, hosting in France, no commitment, and no per-user fees.

To learn more about the differences between off-the-shelf and custom software, check out our article “ Business Software: Definition, Benefits, and Custom Development ."

CRM Case Study: For 50 users over 3 years, Salesforce costs €300,000 (€200,000 for licenses + €80,000 for integration + €20,000 for migration). A custom-built CRM from IT Systèmes costs less than €50,000 all-inclusive—a savings of €250,000 (83% reduction). Plus: unlimited users, full ownership of the code, free migration, and hosting in France. To learn more, check out our article “ Custom CRM: Why and How to Have Yours Developed."

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Why Choose IT Systèmes for Your Business Software

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Software Developer and Integrator: We don’t just develop your software. We integrate it into your existing IT systems (ERP, CRM, EDM, M365, Active Directory) so that it fits seamlessly into your daily operations.
AI-Accelerated Development: Our team of developers uses generative AI to speed up code generation, testing, and documentation. The result: development times reduced by a factor of 3 to 5 compared to traditional development.
Agile methodology with short sprints: incremental deliveries every 2–3 weeks. You test, you validate, we adjust. No six-month-long projects with no visibility.
Robust, cloud-native architecture: microservices, containers, REST APIs, DevSecOps. Your software is scalable, secure, and portable (on-premises, cloud, hybrid).
Security and compliance by design: GDPR, ISO 27001, NIS2. Encryption, strong authentication (MFA, Azure AD SSO), logging, and security audits at the end of each sprint.
Maintenance and Long-Term Development (TMA): Your software grows and evolves alongside your business. Bug fixes, updates, new features, and responsive support.

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Learn more about our expertise as a software developer and integrator →

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Automate your processes with Power Automate →

A clear, rapid and personalized approach

Make an appointment

Quick Audit

Identifying the tool to be replaced and analyzing your business needs. We review your current processes, identify pain points, and explore opportunities for improvement. This phase is free of charge and involves no obligation on your part.

ROI Calculation

Let’s work together to calculate the exact impact on your cash flow and operating costs. We’ll provide you with a detailed comparison between your current solution and our proposal, including projections for 1, 3, and 5 years. You can then make an informed decision.

Working prototype (not a set of specifications)

No more endless, incomprehensible documents. We start with your initial ideas to create a working prototype in just a few days. You approve based on something concrete, not something abstract. This approach drastically reduces misunderstandings and speeds up the launch.

Development in 2-week sprints

Iterative deliveries every two weeks. You can track progress in real time on a shared dashboard and adjust priorities as needed. Clean Architecture: clean, well-documented, and structured code that any qualified developer can pick up and run with. Full connectivity: API integration with your entire digital ecosystem.

Deployment and Continuous Improvement

Data migration (included), team training, and phased deployment. Your software evolves alongside your business: new features, new workflows, and new integrations. Our contracts have no minimum term—our customers stay because they’re satisfied, not because they’re forced to.

Your IT experts

Contact an expert

Anthony

Outsourcing Manager

Mohamed

Account manager

Mathis

Developer

Laure

Nadia

Accountant

Johana

Computer technician

Julien

Computer engineer

Yann

Computer engineer

Amine

Computer technician

Anaïs

ADV

Olivier

Technical Manager

Adrien

Computer engineer

Valentin

Computer engineer

Samir

Chairman - Partner

Laudine

Computer engineer

Matthias

Account manager

David

Partner manager

Théo

Account manager

Sofiene

Account manager

Peter

Project Manager

Quentin

Computer engineer

Christian

Computer engineer

Oxana

Marketing

Arthur

Computer technician

Florent

General Manager - Partner

William

ModernWork technical manager

Amir

Developer

Kevin

Development Director

Emmanuel

Operations Manager

Thomas

Computer engineer

Samuel

Project Manager

What is the difference between custom business software and standard SaaS?

Standard SaaS solutions (Salesforce, Sage, Monday, etc.) address general-purpose needs. Custom business software is designed specifically for YOUR processes, YOUR management rules, and YOUR users. You don’t have to adapt your business to the tool—the tool adapts to you. And you own it.

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How long does it take to develop business software?

With our AI-powered Agile methodology, a simple application can be delivered in 6 to 8 weeks. A full-featured software solution with integrations (ERP, CRM, EDM) takes 3 to 5 months. Thanks to short sprints, you’ll have usable versions as early as the first few weeks.

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How much does custom business software cost?

Our packages are transparent and all-inclusive. Small-scale solution (replacing Excel, Access, or small software applications): under €10,000, under 10 days. Custom CRM (replacing Salesforce, HubSpot, or Dynamics): under €50,000, under 50 days. ERP / Core Business (replacing Odoo, SAP, Cegid): less than €100,000, less than 100 days. All packages include: unlimited users, code ownership, free migration, hosting in France. No commitment, no per-user cost. Ongoing maintenance (TMA) represents 15–20% of the initial cost per year.

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What technologies do you use?

Backend: Java, Python, C#, PHP. Frontend: ReactJS, NextJS, VueJS. Databases: SQL Server, PostgreSQL, MongoDB. Cloud: Azure, AWS. Integration: REST APIs, GraphQL. Security: DevSecOps, Azure AD, MFA, TLS encryption. We choose the best combination based on your specific needs, without locking you into a single technology.

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How does AI accelerate development?

Our team uses generative AI at every stage: generating boilerplate code, writing unit tests, automating documentation, assisting with code reviews, and creating UX mockups. AI doesn’t replace developers—it boosts their productivity. The result: development times and costs reduced by a factor of 3 to 5 in certain phases.

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How do you integrate the software into my existing IT system?

We connect your business software to your existing tools via secure APIs (REST/GraphQL), native connectors (Power Automate, M365), or custom middleware (FlexFlow) for legacy systems without APIs. No overhaul of your IT infrastructure is required.

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Is there any financial assistance available for business software?

Yes. There are several programs available for small and medium-sized businesses (SMEs): the research tax credit (CIR) if the project involves innovation, BPI France grants (digital loans), regional digital vouchers, and France Num programs. We can help you identify the grants that are best suited to your project.

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What happens after the system goes live?

We offer a third-party application maintenance (TMA) contract that covers: bug fixes, security updates, functional enhancements, and user support. Your software isn’t static—it evolves alongside your business. Our contracts have no minimum term.

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