Modernizzazione di codice legacy complesso con agenti AI.

Mistral migrated 40,000 lines of a complex Fortran 77 physics simulator to modern C++ for an energy company. The project focused on architectural refactoring rather than simple syntax translation, requiring a new approach to modernization. A critical first step was creating a parity harness to ensure the new C++ code produced numerically identical results to the legacy Fortran system. AI agents were then used to understand and document the legacy codebase before a structured workflow involving human-managed AI agents for coding, testing, and reviewing was implemented to perform the migration. This human-in-the-loop approach proved more effective than fully autonomous agents for handling the project's complexity.