1>Resume/Project related questions. What is REST API. What are http methods and explain each, what is annotations, why we use service controller , print prime numbers from 1 to n, one SQL question> consider employee table now retrieve top 5employees having highest salary. And core java based questions like what is constructor, what is an object, interface, Encapsulation, Polymorphism (run time and compile time). 2nd round(with CTO):- again resume related questions, diffrent types of http methods, and spring boot rest API related questions. 3rd round:- Here again resume related questions, spring boot and core java based questions. After final round they told me to leave and after two three days later I got call. At last I got an offer. Prepare for following topics> core java, spring boot, rest API architecture and MySQL. Also try to add 2-3(CRUD)spring boot related projects in your resume. All the best.