At the New York Public Library, the digital repository continues to grow at an astonishing rate with storage soon to reach petabyte range. As an increasing amount of content is produced, generated, or acquired, workflow automation and scalability became increasingly important. Workflow involves several organizational units using multiple systems. As a result, reducing the dependencies between our various systems was an important criteria. The message queue enables us to design an event driven system built from a suite of lightweight and interoperable REST-based services. Benefits include traditional drivers such as loose coupling, interoperability between heterogeneous systems, improving application scalability, and many more benefits that will be explored in this talk.