Manhattan Associates Interview Question

1 round : (i)Basic of Java and multithreading , String operation related questions & micro services architecture. (ii)they asked one puzzle also, I solved mathematically but since interviewer cram the answer , by mistake he changed question hence he was telling my answer wrong ;-) (iii) Then basic question on spring boot and web services (iv) some small programs base on arrays , star patterns. 2 round : It was totally on architecture and design level of applications . Then few design patterns and my all projects . This interview round was continue till 1.5 hours. 3 round : It was from director and he asked some realtime problems and then few design and architecture level design questions.