It's a long process with multiple steps. You may expect algorithm interviews, coding interviews, system design interviews, and a fit interview.
Although this seems complicated (and it is), you will have time and proper advice to prepare for the interviews properly. There are no tricks involved.
A few algorithm exercises to solve.
A coding exercise to solve and discuss.
The following metrics were computed from 65 interview experiences for the Datadog Software Engineer role in France.
Datadog's interview process for their Software Engineer roles in France is fairly selective, failing a large portion of engineers who go through it.
Candidates reported having very good feelings for Datadog's Software Engineer interview process in France.