First round: This was simple and was normally based on .net core, micro-services, and rest based apis.
Second round: This was also not too difficult and was primarily around .net core, micro services, web APIs , architectural questions and some design patterns.
Third round: This was based on C#, .net core, web api, design pattern, and micro-services, and event-driven architecture.
Foruth round: This was purely based on AWS services