Containerized SaaS startup infrastructure

Problem: a growing SaaS startup had a monolithic infrastructure deployed manually, with frequent downtime during updates. Solution: complete containerisation with Docker, Kubernetes orchestration (K3s), GitLab CI/CD, Grafana/Prometheus monitoring. Sovereign OVHcloud hosting. Result: automated deployments in 3 minutes (vs 2h manually), 99.9% availability, automatic horizontal scaling. 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.