Their Irish recruiters contacted me after a year or more of sending them my CV. I told them I am not interested in changing jobs now and don't want to be another devop in their corpo. So they were pushy, telling fairy tales and forcing me to that interview. They told me to do a task on a binary tree, while not even starting the process. After a week or two, they forced me to do the interview with their Swiss branch. The guy was totally not interested, lying during the interview and after, not answering my questions later and not sending me any materials like he promised.

I have had many clashes with UK/IR recruiters and never met such cheeky persons.

Traverse through a binary tree to find the answer to logging in somewhere.