I applied online. The process took 3 weeks. I interviewed at Datadog (Paris) in Dec 2019
Interview
The overall process was well explained and was on the acceptable level of difficulty. It took a bit too much of time but acceptable.
1) Screen call
2) Online coding exercise with one of developers
3) Take-home task
4) On site interview: coding task, system design, hiring manager
Interview questions [3]
Question 1
DFS problem, give minimum number of coins for a given amount (amount 55 cents, given 1 coin of 50 cents + 1 coin on 5 cents)