Microsoft Senior Software Developer Engineer interview questions

The design question was easy but the interviewer always wanted more of it, the question was how to handle online and offline status on mobile devices but it is more complex than you imagine. The programming question was a binary tree in steroids because unless you mastered binary tree mechanics you would never be able to answer that, and the last question was something like Two Sum, or Three Sum, but mixed with String manipulation and conversion to integer back and forth.