Core java questions: Code snippets shown to answer Hashmap working Singleton class Exception and error Stack overflow error Rest Architecture and Dependency used Dependency injection and Annotation Serialization String literal Design Patterns used Object class methods Last change you did in current project Hr round questions: Introduction Role in project Explain project Modules you worked Last change you did in current project Agile advantage Code reviewing tool and techniques why string buffer is mutable(which is also string) Find the fourth salary of employee

I applied for backend developer role. They asked pretty good questions.