Unexpected call from HR. I think they pretty much finished the first part of interview (non-technical) in that call. I was not even awake when I got that call! The technical interview is scheduled after the call, roughly one week later. The phone interview is conducted by one engineer. Webex is prepared but never used. I guess I was just not good enough to move to that stage. Some of the questions that I remember: calculate the eigenvalue of a matrix determine if the limit exists for a piecewise function what is the possible value of a function at a knowing the value and first order derivative at b rank of a matrix controllable canonical form from a transfer function PID control position control in open loop system bode diagram, phase margin stability (mathematical proof) how to save variables using mat file difference between break and continue difference between script and function how objects are passed in java, by value or by reference can you force garbage recycle in java pointer recursive method ...