It was easy but majority of questions were asked based on DSA and the salary they offered was also great it was overall great experience. And the interviewer was easy going too.

don't make assumption, clarify some quetions in order to understand the constraints and user case requirements clarification, system interface design what's the constraint to ask: like requests per second, requests types, data written per second, data read per second. always remember: the fundamental functionality processing and servers storage caching cocurrency and communication load balance and proxy CDN security