Went through a HeadHunter who they had some beef with lol. Did 1 or 2 30minuts interview, then Coding Challenge at home, then 2h with CTO then offer. In the end, after having spent around 10 hours on the coding challenge and after an interview with the CTO who seemed to be very nice, they just coldly declined because of my work authorization, which they said was OK at first ?! I don't regret the time spent on the coding challenge (which I destroyed), it's just a pity that it didn't work in the end... Best of luck AA :) !