Contacted by a recruiter via email. There was a 30 minute phone chat with a recruiter that was not technical ((what's you're favorite thing about slack, tell me about yourself, etc)) After that you are emailed a link to a Codility challenge. The challenge was pretty easy so don't stress to much about it! One question asked you to convert seconds to hr:min:sec format. The others required more thought but yeah, they weren't outrageous. You have 2 hours to complete 3 questions. If you pass this, you go on to speak to a hiring manager. They will ask you more behavioral questions. It's described as a technical discussion. "What don't you like about slack?" I did not make it past this step but I've heard this is the last step. The process does not seem too hard and I will definitely be trying again in the future.