I applied online. The process took 2 weeks. I interviewed at Prezi (Budapest) in Feb 2014
Interview
Can be so quick that you will have no time to prepare yourself )) Really enjoyed the whole process.
But, my advice is "don't be too simple". During your assessment week in the office, you should better spend some time on "playing the muscles" with a team instead of working solely on your task. Eventually and unexpectedly nobody will look at your source or commits, so you should better start marketing yourself to your team.
Good choice and good luck!
Interview questions [1]
Question 1
Well, good to you know Java-ish programming patterns (composition, class decorator etc) and algorithms (only trivial things - no sorting/tries/dynamic programming). And most important – nobody pays for your javascript-related knowledges =)
Unexpected old-fashioned question - "Why should we hire you?".