Given we are so transparent, it seems that most folks who conduct interviews at GitLab expect candidates to have done a fair bit of research in advance of the interviews. So if you're looking to join the Developer Evangelism team, brushing up on our handbook and familiarizing yourself with what we do would be a good idea. That will allow you to come to the interview prepared to frame your experience and abilities through the lens of how we work and the results we aim to deliver to GitLab and our community.
We share details on the process in our handbook: https://about.gitlab.com/handbook/hiring/interviewing