Questions ## Technical Round # Java-8 - Internal implementation of HashMap [B-Tree] - Binary Search Tree # Spring-boot - Actuator & its use # Microservices - Why Microservices. Diff b/w monolith & Microservices # Program - Program to remove duplicates using Java 8 ## Technical Round 2 # Pattern - Singleton class. What is more important feature. How to ensure it doesn't get effected by reflection # Spring boot - Caching concept - Rest service which sends the sequence number on every hit, how to make it works for 1 million hits - Availability - Multiple instances - Scalable on high frequency # Database - Difference b/w nosql & sql database