Buck is a build system that encourages the creation of small, reusable modules consisting of code and resources. It was invented by Facebook engineers to speed up their Android app developlement process.

Recently Facebook made Buck Open Source. This talk introduces Buck and compares it with traditional build system like Maven. It describes how Gerrit, one of the popular Java projects greatly reduced its average build time from ~7 minutes (with Maven) to ~2 minutes (with Buck) or even 0.5 seconds (using Buck daemon).