In a test-driven approach, process development and tests are closely related to each other and thus the task of the developer is only complete once the process has been both designed and tested. Once the Business Model is defined, the development team can start designing the processes which are called Jobs.
In a Data Integration-oriented Development environment, developers need:
the Studio and/or CommandLine (same as the Studio without GUI), where they design and generate the Jobs,
a Subversion server, in order to store their items (Jobs, metadata, etc.) into a shared repository,
the Talend Administration Center application to schedule the execution of the Jobs,
an execution server, to deploy and execute their Jobs.