The process began with a recruiter screen, then moved onto a Manager 1:1 phone screen. After that, I conducted a chronological interview and the final round was a presentation. Slack's interview process is thorough and you should be prepared to talk about your work experience in great detail. I was very impressed with the recruiting process; they were quick to provide feedback and move me on to the next stage. The recruiter Mike was part recruiter/part guide, letting me know how I could improve through each round.