Tool rationalization into unified application

Problem: the company used 7 different tools (Excel, Trello, Google Sheets, emails, WhatsApp, a CRM and an invoicing tool) without integration. Solution: development of a unified business application centralising project management, CRM, invoicing and reporting. Stack: React, Node.js, PostgreSQL, sovereign hosting. Result: from 7 tools to 1, 20 hours/week saved, complete activity visibility. This case study details the context, architecture choices, delivery steps, observed outcomes and follow-up criteria agreed with the client. Powehi documente les décisions, les contraintes de sécurité, la méthode de déploiement, les indicateurs de réussite, les enseignements et les prochaines étapes afin que chaque exemple puisse être comparé à une situation réelle de PME.