Triquesta Senior Software Engineer interview questions

Face to face interview along with written exam ask to write a code find sum of n nos which are divisible by 3 and 5 and then ask to reduce the complexity from O(n) to some lower number. After discussion on code asked questions on core JAVA specially collections,interface,abstraction,Hibernate,Struts framework.be ready for tricky questions too Should be able to explain what work we have done so far and it should match with resume.