Employee Referral: 1st Phone Interview : Very technical I barely made but the manager was very understanding Wanted a indepth knowledge regarding socket programming and how it works in Kernel (skbuf ). Some coding questions and OS questions Onsite Interview: 1st Engineer: Pointer arithmetic questions Trie Data Structure for routing tables Difference between pointer to const and const pointer and its uses Designing Server client model 2nd Engineer A lot of OS questions, memory management, synchronization issues and a puzzle in the end :) OS questions (processes vs threads) , how does fork work, what happens if parent dies and virtual memory and stuff. 3rd Manager talk , what are your expectations and stuff 4th Engineer: C coding on bitmask Security concepts (SSL and stuff) 5th Engineer: Was a lot unprepared and was always thinking what to ask and not. Again socket programming and some bitmask questions and some C++ and pointers questions. Overall good folks and good experience 3rd Round: Director ARP Spoofing SSL and security realted questions I did manage to clear all interviews, but their was some kind of hiring freeze so they kept me on hold for ever :)