half a hour. it is a call from hiring manager. and it is a conference line. you had to input your application ID after you dial the phone number. It is a positive experience. questions mostly about behaviour in the phone call. and it is technical in the on-site interview. more detailed questions would be asked. prepare yourself with programming language, operating system, networking would be helpful. i.e. Threads vs processes 1. Threads are easier to create than processes since they don't require a separate address space. 2. Multithreading requires careful programming since threads share data strucures that should only be modified by one thread at a time. Unlike threads, processes don't share the same address space.