I used to work for Datacratic <http://datacratic.com> http://datacratic.com> for a year and a half and I'd say a good 35 to 50% of the time was spent working on

I used to work for Datacratic <http://datacratic.com> http://datacratic.com> for a year and a half and I'd say a good 35 to 50% of the time was spent working on RTBkit <http://rtbkit.org> http://rtbkit.org>, an open source real time bidding framework on which part of our products were built on. Honestly, it's a pretty good feeling, it's fun, let's you interact with a larger community from which you can learn from and it might pave the way to gigs.