A rather disappointing interview... they care more about leetcode problems then they do about about actual experience. i have 5 years of embedded C experience , 3 years working on personal and open source programing plus a masters degree on top, but that seemed to hold no value with them, they 1st put me through a simple leetcode problem where i had to format a string, and then they asked for a 2nd whiteboard interview where the 1st thing i was told is that we are not here to talk about my past experience and that there will probably be a 3rd and even a 4th round, Regarding the task, i was given a rather simple problem of finding a missing number in an array of consecutive numbers. I wanted to do an efficient binary search algorithm rather than the simple linear search, however it took more time than i expected since i did not use these algorithms in over 12 years so i was very rusty so i was already 45 minutes into a 1:30 hour interview and as i was just debugging the final step the host intervened and said nope this is taking too long there is no point to continue and he stopped the interview there.. honestly i have no idea and am curious if i could have gotten away with using the simple method which i could have finished in maybe 3 minutes tops, but given that he hasn't stopped me when i tried to do the complex one i believe the simple one was insufficient. Conclusion: unless u do leetcode and are good at it... don't bother with them. you are wasting your time and from the looks of it the whole interview can last several weeks. P.S. after the interview i went ahead and redid the problem.. i was able to make it work in about the same time i spent solving it during the interview