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RubyWrite is a Domain Specific Language (DSL), embedded within Ruby, with the goal of providing an extensible, effective, portable, and easy to use framework for encoding source-level transformations. Embedding within Ruby provides access to the powerful features of Ruby, including its meta-programming capabilities. Ruby’s multi-paradigm programming model and flexible syntax drove our decision to use it as a host language. Easy integration with C interfaces lets us move performance critical operations to C, or link with external libraries. RubyWrite consists of three components, a tree builder, an unparser, and a tree rewriter. It has been used in multiple compiler research projects and as a teaching aid in a graduate-level compilers course. We expect RubyWrite to be widely applicable and a proof of concept in leveraging a modern language to write a portable compiler infrastructure core