I applied in-person. The process took 4 days. I interviewed at HOVA Flight Services (Ashland, VA) in Oct 2017
Interview
Very straightforward. Some technical questions, some personal questions. The pilot market is very hot right now, so the industry is not very competitive. If you are a substandard CFI, you will have problems, though.
Interview questions [1]
Question 1
How much experience do you have with Part 141 schools?