Engineers at Twitter created and open sourced the now healthy-OSS Pants build tool (http://www.pantsbuild.org/) to build a growing, multi-language, multi-million line codebase. While Pants builds a growing handful of languages, its tight integration with the zinc incremental Scala/Java compiler means that one of its specialities is large Scala projects. This talk will work to convince you that using Pants with a Scala monorepo is the right choice for either your cluster of open source projects or company codebase.