There is only one unpleasant experience, it is the system design interview. The interviewer kept prying the system architecture I designed in my last summer internship, where I did in a small startup. He asked every details and clearly impatient and displeased with the simple design I brought about. That made me uncomfortable, since his questions are based on some facts which already happened in the past and there is nothing I can change about. And clearly my design is also based on the practical need and some conventions already established in that company. Wouldn't it be more proper that questions are drawn like "what's your opinion over XXX situation? what's your ideal design if faced with XXX?" Instead, I am getting responses like "Oh so you guys make it this simple? Why?" with displeased expressions. I felt it so unfair since he was evaluating the company I interned in but not myself. Just hope these kind of interview questions can be better designed. nobody likes being put in the situation that either you lie about the things you did or you admitted some naive design you have applied, which is actually very reasonable under that certain practical circumstance.