Efficient cloud development does not only include a quick deployment of services in the cloud. A smooth development and debugging of services directly in the cloud also increases efficiency. In addition, the development environment should be as identical as possible to the production environment. The 12-factor app listing in point 10: "Dev / prod parity" recommends this fact. In this session, a selection of open source tools will be presented that help a Java developer achieve the following goals: fast and synchronous deployment (Skaffold), development and debugging inside Kubernetes pods (OpenLiberty with Ksync, Quarkus Live Coding), extending the Kubernetes perimeter for local development (telepresence or Bridge to Kubernetes). The easy handling of these tools will be illustrated by the associated demos in this session.