I found the interview process interesting but disorganised which is my general impression of this organisation. The startup mentality thing is just a ruse/a bit of a red flag. Lack of transparency about salary too.
I applied through an employee referral. The process took 4 weeks. I interviewed at The Collective (London, England) in Jan 2018
Interview
Phone interview, then in person interview as a second stage. Quite informal and very friendly. I was recommended by a friend which helped. Best to do your research on the company first as they offer quite a unique living proposition.
Interview questions [1]
Question 1
What do you know about The Collective? How did you hear about us?