A few months after applying for the position, I was contacted by a recruiter to schedule a call with a designer on the team. During the call we discussed my experience, process and a recent project. Shortly after the call, I was informed the team wanted me to come onsite for the second round.
The second interview was 5 hours long and included a presentation of recent work, white boarding exercise, visual design interview and 1:1s with the design manager and product lead for the team I'd join.
The next day, the recruiter asked for my availability for a call with Slack's Head of Product Design. The call was friendly and short -- mostly a "get to know you" call. I was able to ask lots of questions about the company and team.
The next day, the recruiter asked to schedule another call. During the call, they extended an offer to join the team.
I spoke with the recruiter on and off throughout the interview process as well. They were very responsive and helpful. And everyone I met or spoke with at the company was incredibly friendly and welcoming each step of the way.