I was contacted within 2 days of submitting the application in Early January (was surprised to see their fast response!)
Recruiter was very friendly and outlined everything I could expect in the general call. The call itself was as expected -- questions about my interest in Slack, my interest behind product design, a rundown of two of my most recent work places on my resume, and what I'd been up to. My recruiter then outlined the structure of the internship program and told me I'd be moving forward and completing a design exercise for the next step in the process.
The exercise focused on a hypothetical company -- a video conferencing tool -- and I was given 2 problems I could solve within it. The problem I chose to tackle was centered on the fact that people tend to miss visuals during a video conference when they write notes, so how could this company make the note-taking process easier and more efficient.
The next step was presenting the exercise to a designer at Slack -- guiding them through your entire thought process and telling a story of a user and how they would use your proposed solution. The designer gave me great feedback and I implemented them in time for the next step: the Panel Presentation.
The panel was 3 designers at Slack, to whom i presented one of the projects on my portfolio, which they really broke down and asked me a lot of questions on. They were interested in knowing the reasoning behind my design decisions, as well as checking to see if I had thought about ways it could be mishandled, etc. Lots of what-if questions. Know your product and reasoning thoroughly!
After this step I had 2 individual interviews with the 2 of the same designers that were in the panel presentation. They asked me about what I hoped to gain out of this internship, behavioral questions, how I handle design and its different sides, areas that were my strengths and areas I could improve on, etc.
I received an offer a day after this last step.
