Context & objectives
As part of modernising the OPB industrial sorting system, La Poste wanted to replace a legacy tool for generating the N7.CBL file — a central file used by automated sorting equipment. Previously generated via an Excel tool with VBA macros, this process carried a high risk of human error, maintenance difficulties, no traceability and no secure access.
The goal: design an ergonomic, secure and maintainable web application that automatically generates the N7.CBL file, with configuration, editing, simulation and visualisation features.
less processing time
to replace the obsolete process
Architecture & features
Co-built through framing workshops then developed in Agile Scrum (two-week sprints), the application relies on a robust stack: ReactJS 18 / TypeScript on the front, Java 17 / Spring Boot on the back, a PostgreSQL database, Jenkins & GitlabCI CI/CD, Ansible + AWX deployment on an internal Ubuntu VM (no internet access).
Key features: automatic N7.CBL generation, a configuration interface (sequences, associations, labels), version management and history, simulation and export, preview and built-in consistency checks (format, ranks, business constraints).
Results
In under 3 months, the application replaced an obsolete process with a modern, secure solution: a secured generation process, drastically reduced human error, processing time cut by 70%, strengthened compliance and maintainability ensured by module decoupling and deployment automation.
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