The code debugging part of the technical interview was difficult because it was their code base which I was not familiar with and they were in the room the whole time, constantly asking me what I was thinking. It wasn't a true test of someone's debugging ability.
I would reconsider going for another job that had a psychometric test as part of the interview process. Its the one step where they learn something from you but do not give feedback or offer anything of themselves.
individual responses to each which demonstrated some experience and technical backing. Where a direct question couldn't be answered, i was honest and provided best background answers and knowledge which could be used to derive a solution from.