I was not approved because I am not entirely fluent, but I have been considered advanced in several interviews before in others companies and it was not a problem. I think Toptal is going to lose a lot of candidates thinking like that and not giving them a chance to become fluent during projects.

First you apply. you will get a link for a screening interview. (you can edit your interview if the time is not suitable for you. One screen video call 15min. they arrange the technical interview (you have 48h deadline to start it) One DSA assesment 1h (3 exercises)