Jane Street's journey with build systems led to the creation of Dune, a fast and popular OCaml build tool that recently replaced their internal Jenga system. After significant optimization work, Dune now efficiently handles Jane Street's 70M-line repository while maintaining better performance than its predecessor. The transition represents a unified approach to OCaml build systems, with ongoing improvements being contributed back to the open-source community.
https://blog.janestreet.com/how-we-accidentally-built-a-better-build-system-for-ocaml-index/