Understandable that interviewers won't call exactly on the dot of your scheduled time, but 30 minutes late? Don't get me wrong, this seems like a great company to work for but the person I spoke to gave me a terrible impression based on timeliness and tone of voice. Completely unprofessional from that person's side and unacceptable especially when it's a full-time, unpaid position. Average interview, be passionate about your experiences and know why you want to work at BB.
Mainly discussion and a copy test -- just wrote a couple headlines, a few pitches for boxes. Make sure to avoid silly beauty buzz words: 'tresses' or 'strands' for hair etc.
J'ai postulé en ligne. Le processus a pris 3 semaines. J'ai passé un entretien chez Birchbox (New York, NY) en avr. 2018
Entretien
Phone screening plus in person interview -- both with the person who became my manager, so no HR screening. The first interview had a lot of behavior questions and just getting to know me, and the second interview had more specific questions about my skills and experience. I would recommend to have really specific examples of things you did well in the past, things you're improving about yourself, etc.