Multi-tenant software publisher architecture

Problem: a software publisher managed each client in a separate instance (30 instances), making updates and maintenance extremely costly. Solution: redesign to a secure multi-tenant architecture (PostgreSQL schema isolation, RBAC, per-tenant encryption). Progressive migration of 30 instances. Result: infrastructure costs reduced by 60%, update deployment in 1 operation instead of 30. 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.