If you wish to contribute to joind.in, please be sure to read/subscribe to the following resources:
- Contributor's Guide: https://github.com/joindin/joind.in/wiki/How-to-Contribute-Code
- Contributor's mailing list: http://groups.google.com/group/joindin-developers
- Contributor's IRC channel: #joind.in on Freenode.net
You should work on what you want to. Our bug tracker is here: https://joindin.jira.com
Any issues that have the "hackathon" or "easypick" label are ones that we think are a good starting point. This JIRA filter will give you the list of all current issues with the "hackathon" or "easypick" issues.
If you have any problems, ask on the IRC channel or send an email to the mailing list.