A "brief interview" refers to a short conversation or discussion where questions are asked and answered. It does not last for a long time and is meant to gather specific information without taking up too much time.
Each issue will include a note from the editor introducing the writer and poet, as well as occasional bonus content such as playlists, illustrations or brief interviews with the authors. (readersentertainment.com)
Often, the candidate moves from table to table or room to room where different people conduct brief interviews. (job-hunt.org)