I applied online. The process took 1 day. I interviewed at 1Pv6 (London, England) in Dec 2014
Interview
The very first process was to acknowledge my application which of course they send me an acknowledgement email.
That was followed by a telephone interview which went very well. Needed to check by my ability and technical experience.
After that I was invited for a second interview in the office which also went very well, there was more of technical interview questions.