You personally do not need a pilot certificate, but you must have a PIC that does, and a visual observer (VO). You could be the VO.
It reminds me of the law where I live that requires the newspaper delivery boy of 11 years old that must have a motorcycle license to use his bicycle to deliver my newspaper.
(Please don't flame me, I was just offering an analogy).
Ok now I may be a little confused. What do you mean by "PIC"? I want to pilot the UAV. I don't want to observe.