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.