Buck2

Buck2 is a large-scale build system developed by Meta, designed to handle massive monorepos with extreme efficiency. It is the successor to the original Buck and is written in Rust. Buck2 focuses on performance and correctness, utilizing a highly parallelized execution engine and advanced caching. It is particularly well-suited for organizations that have outgrown traditional build tools and need a system capable of handling millions of lines of code across multiple languages, similar to the scale of Meta's own internal infrastructure.