Palantir Technologies - Palo Alto, CA <a href="http://www.palantir.com" >. 
We build data fusion platforms for integrating, managing, and securing any kind of data, at massive scale. On top of these platforms, we layer applications for fully interactive, human-driven, machine-assisted analysis.
Build Systems/Internal Tools:  
The Internal Tools team at Palantir owns continuous integration, artifact &amp; dependency management, build tools, source code management, and much more. We use a combination of open-source software (e.g. Gerrit, Jenkins, Ivy, Gradle), third-party enterprise software (e.g. Atlassian Bamboo and Stash), and in-house magic to develop robust and scalable systems.
<a href="https://www.palantir.com/careers/OpenPosDetail?id=a0m80000002LiKaAAK" >
Questions? Drop me an email at REDACTED_EMAIL
Ask HN: Who is hiring? (December 2014)