Brain teasers, technical questions and algorithms. Interviewer doesn't care about your thinking process and just wants you to write your solutions on a paper. He even leaves the room for some of the time.
Interview questions [1]
Question 1
Find some errors in a C program dealing with pointers to pointers.
I applied online. The process took 3 weeks. I interviewed at PTC (Barcelona) in Jan 2020
Interview
First I got an email from HR in order to set up a motivational call, they I got another call from HR in order to explain to me the role and everything regarding documents, then I had a call with the hiring manager and the final call with the offer
Nice process, people are friendly and just answer the question and be yourself. really less hard question but please be prepared before going to this interview. Nothing more and really nice experience, nice company and good interview. Good luck