Gartner says worldwide IT spending will increase 3.8 percent in 2013 to reach $3.7 trillion, and that excitement for big data is leading the way. By 2015, the analyst and market research firm says, 4.4 million jobs will be created to support big data. And beyond big data the demand for IT employees keeps growing as well. According to Robert Half Technology, the pool of available talent continues to shrink, driving average salaries up as much as 9 percent from 2012. Here are 10 hot IT jobs predicted for 2013 and beyond.