Extending the lifespan of legacy software is essential, because it usually supports operations that are critical to a company's business. Complete rewrites or migrations are often too risky and too expensive. In many cases, a targeted approach delivers a better return on investment.
A large company operating across Europe, specialized in payment processes and Point of Sale (POS) services, relied on an internal tool to manage software updates. That tool enforced strict access control and an electronic signature to guarantee the integrity of every delivery.
The internal web application had been developed by an external vendor, but the source code was never delivered. To modify the system, the client was forced to go through a decompilation process. New features were needed to keep up with changing requirements.
We were tasked with integrating new features into this legacy system while strictly preserving its existing behavior. No regression was acceptable.
This tool, essential to the company, guaranteed the integrity of every update delivered.
To get there, we chose an iterative strategy:
Building a test suite targeting the essential features at risk of being impacted by changes.
Implementing a structured logging strategy to make debugging easier.
Integrating static analysis tools to improve code quality and detect hidden issues.
Working with the technical teams and the users to reconcile the documentation with real implementation and usage.
On top of delivering new features with full compatibility with the existing system, we:
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