The actual interview was fine, the questions were very basic if you do any prep you will be fine, but in my case, they will put you through 3 rounds of interview in a span of a week after not contacting you for many months and won't even send you a rejection email nor a call, kind of disappointing...

Straightforward and fair. Interviewers are friendly ask about relevant experience and questions about the preliminary test you take. Interview process was logical you meet members of the team and eventually more senior members if you continue through.