Checks problem-solving skills and grills in-depth on core Java and the Spring framework. They ask about the internals of everything you talk about, so be prepared for whatever you say. Expect direct, real-time questions.

Array rotation program.

Design LRU cache.

Program to find the least positive integer of a given array.

Java HashMap internal architecture.

Spring Boot autoconfiguration internal working.

Object class?

Immutability design patterns?

AWS different services? Distributed architecture.

JVM internal memory management. Garbage collection heap management.