I applied online. The process took 2 weeks. I interviewed at National Instruments (Austin, TX) in Oct 2011
Interview
4 panels of 2 to 3 people each consisting of a mixed bag of Electronic Engineers and Senior Group Managers. The interviews went all day long with an onsite lunch break at one of the three onsite cafeterias. The entire process was very smooth and everyone involved was very professional.
Interview questions [1]
Question 1
Using as many max / min devices as you want design a circuit that will sort 4 numbers input at any random order from minimum to maximum.