If you want to be a design engineer at Linear, besides knowing circuit fundamentals (R's, C's, L's) you really have to know your transistors. Current mirrors, current sources, diff pairs, cascoding, matching, op-amps, etc. You should also know control systems, noise gain, miller effect, etc. Last but not least, a knowledge of device structure, physics, and non-idealities is necessary. Some companies pride themselves in being able to train monkeys to be design engineers, but Linear only accepts the very best.

He asked basic questions, one current mirror matching problem, one circuit transfer function, one noise related quesiton