Over the past year, Evergreen has been adopted by a number of libraries in Ontario. While it is built on a flexible, scalable architecture and offers an impressive set of features, the Evergreen community needs a broader base of developers who are able to contribute to the base functionality and create customized Evergreen instances. This workshop will provide developers with the tools they need to contribute to the Evergreen project and better serve their libraries, tackling subjects such as creating a new OpenSRF service, accessing data with permission-based methods, customizing the database schema and IDL, and building AJAX interfaces with the OpenILS Dojo widgets.