Apache Kylin is always looking for contributions of not only code, but also usage document, performance report, Q&A etc. All kinds of contributions pave the way towards a Kylin Committer. There is opportunity for everyone, especially for those come from analysis and solution background, due to the lacking of content from user and solution perspective.
Here is the development document for Apache kylin 4.x. heck the development documents of other versions:
Check out the How to Contribute document.
Apache Kylin™ source code is version controlled using Git version control: Commits Summary Source Repo: https://github.com/apache/kylin
Mirrored to Gitbox: https://gitbox.apache.org/repos/asf?p=kylin.git
Track issues on the “Kylin” Project on the Apache JIRA (browse).