Isopod is an expressive DSL framework for Kubernetes configuration. Without intermediate YAML artifacts, Isopod renders Kubernetes objects as Protocol Buffers, so they are strongly typed and consumed directly by the Kubernetes API. With Isopod, configurations are scripted in Starlark, a Python dialect by Google also used by Bazel and Buck build systems. Isopod offers runtime built-ins to access services and utilities such as Vault secret management, Kubernetes apiserver, HTTP requester, Base64 encoder, and UUID generator, etc. Isopod uses separate runtime for unit tests to mock all built-ins, providing the test coverage not possible before.