We use spark heavily at work (rolling it out to many departments / users - roughly 1800 users). I am highly interested in getting involved-in-and-getting my-hands-dirty-with spark. I currently work as a Programmer Analyst developing our Kuali suite of systems. I am pretty up to snuff on both Java and SVN so I expect I can dive pretty much head first into this .
Because of my work schedule, I would be able to dedicate mostly hours on the weekend or free cycles throughout the week.