Fabián Sellés Rosa, Tech Lead at Adevinta, presents a retrospective on eight years of running Kubernetes in production. From early experimentation with self-hosted, multitenant clusters to managing 30+ clusters across four regions today, this talk outlines the strategic and technical milestones that shaped their internal platform serving over 5,000 developers and handling 400,000 requests per second. Sellés traces the journey from manual control plane management and experimental developer abstractions to migrating to a managed control plane and implementing seamless in-place upgrades. Along the way, he reflects on lessons from blue-green deployment strategies, cluster scaling, multitenancy tradeoffs, and risk management - illustrated through real-world experiences like the adoption of FiaaS, Common Platform UI, and challenges with the nginx ingress controller. Attendees will gain practical insights into platform maturity, long-term sustainability, and how Hyrum’s Law plays out in high-scale environments. This session is a candid look at the do’s and don’ts of evolving Kubernetes platforms in complex, fast-paced organizations.