Discover how to build an internal Platform-as-a-Service using open-source and CNCF technologies in this keynote presentation from KubeCon + CloudNativeCon Europe 2021. Explore GoSpotCheck's journey of migrating from a PaaS to Kubernetes and their subsequent efforts to simplify the development experience. Learn about the strategic implementation of tools such as Buildpacks, Helm, OpenTelemetry, Prometheus, Envoy, LinkerD, and gRPC to create a smoother workflow for developers. Gain insights on making informed decisions between in-house solutions and vendor options, and understand how to craft a developer-friendly experience using Cloud Native technologies. The presentation covers topics including migration challenges, ecosystem integration, observability, service mesh, ingress, build and deploy processes, and the application of Conway's Law in platform development.