Camunda Javascript Developer interview questions

The tech task was nice and just the right size, the person i was talking to on the phone was also very nice and easy to talk to. On site "hacking session" was very open ended, with a lot of conflicting requirements, the interviewer was unfriendly and missguiding, i don't understand what he wanted to achieve. I dont know if he was really trying to missguide me or just don't understand how their own library works thou. But i hope it was an exception, because other people ive been talking to seemed nice and quiet open.