Comcast Java Developer interview questions

Tough interview questions include Singleton pattern, oops concepts, Aws scaling, Availabilty zones, EBS, certification 2 hacker Rank hard questions. Interview process- Hackett rank exam followed by technical interview in which they mostly ask about the hacker rank exam. 3r d round technical interview with manager

There were three rounds happened. 1)Written test - which was easy most of them were from basic java concepts 2)technical F2F - asked most of the questions on algorithms and data structures and some of the questions from microservices architecture and i cleared this round. 3)second technical F@F - we were only 3 qualified for this round and this round was similar to first technical f2f . After the second technical f2f round HR told me that there would be skype interview round which they said they would inform me through mail but haven't recieved any such mail sent many remainder mails but was of no use .