The interview process is very thorough and yet very organic. There is an initial phone interview with the recruiter to get a general sense about your experience, tendencies, viewpoints, work style. The questions are targeted towards identifying people who share the companies core values and the recruiter is very experienced so they will find out what they want to know about you on this call. If they feel you may be a good fit, you will get a homework assignment to test your basic skills, creativity, discretion, and decision-making process. If you get a passing grade on the homework assignment you will then be given the "real interview" with senior level employees who run teams of people. This is conducted by video chat so get a camera and a quiet room if you don't have one. This interview is much like the initial phone interview in that the questions are geared towards identifying people who share the companies core values. One key difference is that this video call will be with two people who will both relentlessly question you. In general, all of the people at AP are very friendly, but they are also very serious professionals so this interview is positive but intense and that's clearly done for a reason. If you pass this interview, there will be a final interview which is really more of a coffee date with someone who works for AP in a town near you. It is an interview, but it is more of a getting to know you before they extend an offer. For this interview, just relax and be yourself. You would not have gotten to this point if they did not like what they saw in you.
This process can take anywhere from a few weeks to a few months. AP is growing very rapidly but they ALWAYS have a plan before they act and that goes double for hiring. If you don't hear anything, they may be moving current employees around from team to team to make room for you or evaluating how many new clients they want to take on to ensure there is enough work to do.