I applied online. I interviewed at Merkle (London, England) in Sept 2019
Interview
4 rounds: CV, video interview and two face-to-face interviews. The video interview felt a bit weird and it is hard to be at your best for this round. If you do a bit of research on the position that you apply, you should be fine.
Interview questions [1]
Question 1
What is programmatic display advertising ? Why Merkle