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Code Legacy: Maintain, Modernize and Optimize
Many companies still rely on software developed years or even decades ago. These applications, often critical to day-to-day operations (customer management, invoicing, logistics, production, etc.), are gradually becoming a hindrance: obsolete technologies, maintenance difficulties, lack of available skills and security vulnerabilities. At IT Systèmes, we help organizations modernize their legacy code. Our starting point is business usage, and we define the most appropriate trajectory: refactoring, encapsulation via API, containerization or migration to modern environments. All our developments follow SOLID principles, guaranteeing scalable, maintainable and secure software, in line with your strategic objectives.
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Our expertise in Code Legacy
Audit and diagnosis of application assets
We take stock of your existing applications, analyzing code, dependencies, available documentation and associated databases. This audit highlights technical debt, security risks, maintenance costs and business priorities.
Refactoring and progressive optimization
Rather than rewriting everything, we prefer to modernize in stages. Refactoring involves improving code structure, eliminating technical debt and enhancing security, while retaining existing functionality. This approach extends software life and reduces costs.
Encapsulation and exposure via APIs
To make your legacy applications interoperable with your modern tools, we develop APIs around your existing modules. This enables you to connect your legacy software to your IS without immediately replacing it, and to move gradually towards a modern architecture.
Migration to current technologies
When legacy code can no longer be optimized, we gradually migrate to current technologies such as .NET Core, Java Spring Boot, Python or Node.js. We ensure compatibility with your cloud (Azure, AWS, GCP) or on-premise environments, while minimizing service interruptions.
Our expertise with
Code Legacy
FAQ Code Legacy
Why modernize legacy software instead of replacing it entirely?
Complete replacement is risky and costly: it often involves total rewriting, service interruptions and loss of functionality for users. Progressive modernization enables you to retain critical functionality, ensure business continuity and reduce risks, while gradually migrating to modern technologies.
What are the possible approaches to modernizing a legacy application?
We combine several methods depending on the context: refactoring of existing code, encapsulation via APIs to make it interoperable, gradual migration to current frameworks and containerization to prepare for cloud operation. This tailor-made approach enables us to move forward step by step, without any break.
How do you guarantee continuity of service during the modernization?
We implement transition strategies such as double-run, where the old and new systems temporarily coexist. Each modernized module is tested under real-life conditions before the switchover. This method avoids interruptions and guarantees gradual adoption by users.
What types of technology are you modernizing?
We work with a wide range of legacy languages and frameworks, such as Cobol, VB6, Delphi, older PHP frameworks, .NET Framework or legacy Java. We then migrate to modern environments such as .NET Core, Java Spring Boot, Python, Node.js, Angular or React, depending on your needs.
How do you ensure the security of older, often vulnerable applications?
We strengthen security by adding encryption, modernizing authentication (MFA, SSO), implementing continuous monitoring and correcting critical vulnerabilities. We also ensure regulatory compliance, notably with RGPD and ISO 27001, to secure your data and processes.
What's the impact on my internal teams?
We involve your teams throughout the project with workshops, user testing and training. A skills transfer is planned to enable them to take control of the new, modernized applications. This encourages adoption and reduces dependence on an external service provider.
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