I was referred internally and was contacted by a recruiter a few weeks later and had a high level phone call. The recruiter was pretty unresponsive and never called or answered during the times scheduled for our call. You can't be shy about calling and calling because that's the only way to get a hold of the recruiter. She was thankful I was on top of it because I doubt she would have taken initiative to call me. Our initial screening was very high level and the recruiter did not know much about the role. Throughout the process, I had to email the recruiter constantly (even to ask if the team had made a decision on the hire).