Rafael Ugolini, a senior software developer at Famoco, shares his expertise on creating a modular Couchbase image using Docker. The image does not require web UI interaction to have a ready-to-go database, utilizing Python and JavaScript for the setup process. The Dockerfile is created with specific configurations such as memory quotas, services, credentials, cluster options, and an entrypoint script that initializes Couchbase Server. The script then configures the node, joins a cluster if specified, sets up memory, services, user credentials, and finally attaches to the Couchbase entrypoint. Rafael provides examples of running a single node or adding multiple nodes to a cluster with detailed instructions and environment variables.