I applied online. I interviewed at Metaswitch (Cambridge, England) in Feb 2016
Interview
A short aptidute test, followed by three longer questions, your answers to which are then discussed in a short interview, followed by a short interview with the manager, talking about my background etc.
Interview questions [1]
Question 1
at least how many cuts does it take to cut a cube into 27 little cubes (like a Rubik's cube)?