The interview was pretty average when it comes to software interviews. Not hard at all but if you did no prep then you might have some difficulty. The interviewer(s) were very helpful and nice. Assisted where they could and discussed the answer afterwards.

(From a friend): Even if you mess up slightly in the technical question, you can still make up for it by being inquisitive and displaying understanding for the mistake.

How would you design a system that does X and has the requirements Y and Z...