EPAM Systems Senior Java Software Engineer interview questions

I am a senior developer. I was contacted through linked in by an epam hr. She had some general discussion on technology as in what technologies i know and work on. Whether i know scala etc, and what are the challenging tasks and assignments i have done in my past career. She also discusses about the recruitment process, that i will have 2 rounds of interview, one with the technical staff, and the other with recruitment manager. The technical interview by some senior guy in epam consists of some basic java concepts such as SOLID, encapsulation, polymorphism etc. The interview as on skype, and the interviewer was more focussed on coding, he asked me to write code that he was monitoring online. Some code on polymorphism, sorting, prime number. The second round was more process oriented with few technical questions on architecture like what is the possible architecture of skype. He was more focussed on agile. I was also given a exercise after the interview, where i was asked to write a junit test suite demonstrating Test Driven Development. The program logic was pretty complex. I did it and submitted to epam. Now i am waiting for the interview plus exercise feedback. Next i need to prepare myself for salary negotiation. Finger crossed. Vivek