EPAM Systems Senior Developer interview questions

The discussion started with a self introduction followed by questions about the projects I have worked on so far and my role in them. Core # Java topics covered: Difference between synchronized and Lock Thread life cycle explanation Can static methods be overridden Can the main method be overloaded and what happens when we do it (a tricky question) #Codinground: Given an integer array with positive and negative numbers, find the maximum continuous subarray and also print the subarray using best left and best right indexes Using Java 8 #streams, given a string like "ganeshkandi", print the index positions of all vowels Spring Boot and #design topics: Difference between #Controller and #RestController Explain different #bean scopes What is a #Singleton class Implement Singleton using double checked locking What is a scheduler in Spring Boot and when it is used Implement #ExecutorService and explain thread pool in it How microservices communicate with each other Additional questions: Do you know about reactive #programming What is WebClient Implement WebClient Why do we need #WebClient if we already have RestTemplate How do you handle authentication and authorization Situation based questions: What is your approach to fix a production issue and where will you start Where is your application deployed Have you written any plugins