I interviewed at Ad Exchange Group (Oxford, England)
Interview
A video call interview, set up by a recruiter. Very simple but did go on for longer than was planned - a positive thing but worth keeping in mind. Follow up came the next day
Interview questions [1]
Question 1
To run through my CV and how it would be relevant to the role
I applied through a recruiter. The process took 1 week. I interviewed at Ad Exchange Group
Interview
Pretty typical process but atypical interview. I got a phone screening which lasted 40 minutes, and the person that I talked to on the phone recommended me to an in person interview.
In person interview lasted well over an hour. The interviewers asked a couple of riddles (brain teasers as they call them), one of them was open ended and the others had definite right or wrong answers.
In between each riddle they asked about my previous experience and pretty typical questions. This was fluff since their final decision was based on the riddles.
The conversation was great but they moved on because I did not get any of their riddles right and they did not like how nervous I was.
The impression I got was that they were looking for MENSA members, not developers. Their reasoning for the riddles was that they wanted to scope candidates based on how they approach different situations, but their riddles were very complicated and not open ended.
Interview questions [3]
Question 1
There are three switches that control three lightbulb in a different room. How can you tell which switch controls which bulb if you're only allowed to enter the room with the light bulbs once?
Imagine you had three boxes
One contains two black marbles
One contains two white marbles
One contains both a black and a white marble
Each box was labeled with their correct contents (BB, WW, BW). However a malevolent intern has swapped the labels so that they are all incorrect.
You are allowed to take one marble out of a box and look at it, without looking inside. Using this method, what is the minimum number of draws you need to determine the contents of all three boxes?