Most developers use Kubernetes, but few understand how it works under the hood. In this hands-on tutorial, I walk through how I built a lightweight version of Kubernetes in Go, including the API server, scheduler, and Kubelet. We'll explore how the reconciliation loop works, how scheduling decisions are made, and how each component interacts. This session demystifies Kubernetes by rebuilding it from first principles. Attendees will leave with a clear understanding of how Kubernetes operates internally. This is perfect for engineers seeking to deepen their platform knowledge through practical examples.