Zef is data-oriented, domain specific language designed for developers building reactive, graph-based systems. We experienced for ourselves and see an increasing for developers to handle complex state, trigger asynchronous workflows, and deliver collaborative experiences. Consisting of 7 core modules, Zef makes the developer experience easier by thoughtfully abstracting away many of the common backend and data overhead to build, manage, and run complex systems. Developers can use one, some, or all modules to address their needs. We're working towards a fully distributed, multi-language (Python, C++, Julia), open source developer experience.