Initial short tech screening with one person, to check nobody's time will be wasted. Then a tech interview with a panel, including some seniors who really knew their stuff. Then a personal interview with a manager. May also have been a HR one in there, can't remember. But whole thing was wrapped up in a week or two. As well as discussion, there was some more structure with multiple-choice quizzes and a programming assignment. These were of reasonable difficulty, but luckily you don't have to get 100% correct.

There were 3 interviews alltogether: 1. introduction interview with HR representative - exchanged information about the candidate, the company and the offer; it took about 15-20 minutes 2. technical interview with two software developers, possible future team leaders; it took about 1.5 hour and concerned mostly on one of the programming languages used in project the offer was focused on and software development itself (e.g. design patterns); while the programming questions were mostly closed (select 1 correct answer out of 4 provided ones), the general software development questions were both closed and open ("no good or bad answers"), 3. technical interview with director-level software engineers; it took over 1 hour and covered general software development questions and again was focused on design pattern; the questions were open and there was no good and bad answer