Initial phone call with recruiter, video call with two researchers (very enjoyable conversation), then a practice research task with two researchers (moderated a role play web usability session). Did NOT require a portfolio. They were very open about what to expect if I got hired and talked very highly about the company. Everything they said positive about the company was totally accurate after I got hired.

I completed three rounds of interviews before receiving and accepting an offer. The first round interview broadly covers your experience as a researcher, including methods and projects you've worked on. The second round is a live exercise based on a short take home assignment. The last round was with the hiring manager and the practice director. I found the interviews to be fair and impartial. There weren't any gotcha questions. They seemed really interested in learning about how you think and work with others.