Explore the intricacies of building a multi-language-input to multi-language-output transpiler in this conference talk from linux.conf.au 2020. Dive into the technical design of a pluggable transpiler that allows developers to export MongoDB queries from Compass into various programming languages. Learn about classic compiler design principles, the use of ANTLR, and how to leverage compiler technologies to create a dynamic, extensible system. Discover the steps taken to make the transpiler community-friendly, enabling easy contribution from diverse language communities. Gain insights on applying this transpiler concept to other use cases, and understand how to extend Compass to support new languages. Suitable for those interested in open source, compilers, parsers, MongoDB, and complex technical problems, this talk provides a unique opportunity to delve into the world of compiler implementation without requiring expert-level knowledge.