It is definitely a very difficult interview process, but makes it so only people well qualified for the job are let through. While certifications and degrees may be good to have, it is not indicative of your knowledge at present. First round was a multiple choice test, ranging from Azure concepts to DNS and networking. If you're at all experienced in the field you should be able to breeze through it. Second round was multiple choice and short answer questions. Similar questions for the multiple choice as round one. The long form questions were a little more involved, either asking you to describe a concept or a scenario and how you would troubleshoot. Third round was a roleplay call between an Atlas employee and yourself, as well as a hands-on remote session with a machine that was suffering from various networking issues.