In 2016 Les Echos acquired JAL - a big online platform for publishing legal ads. Even though the idea of the service was already successful - the codebase, technical solutions and overall look and feel required modernization. It was necessary to rebuild the system from scratch using modern technologies and solutions, new scalable architecture and user-friendly design that would convert much better. A separate challenge consisted in integration with the customer's ERP system and custom data synchronization functionality. We had to ensure that the data exchange is scalable, reliable and secure.