Round 1: Online test on HackerEarth. Cutoff 78. All are mcqs. Round 2: They call it 'Bare Essential' round. Questions asked were from basic fundamentals like- Why Java is called platform independent? Why does Java need compiler? For loop vs do while loop. What is constructor and constructor chaining? What is polymorphism? What is multi threading? What are the different ways to create Thread? Stack vs Queue. How to swap two variables without using any third variable? DML vs DDL. Difference between authentication and authorization. What is web service? What is branching in terms of source control? What is cloud computing? Round 3: Technical Round Questions: Difference between ==, .equals()? Use of static, final keyword. When to use abstract class and when to use interface? How does multiple inheritance work in java? What is the purpose of keyword volatile? How do you create thread? What are the ways? Write a program to get char frequency for a string. What is primary key, foreign key? What if you want to store value null in primary key column? Difference between DELETE & TRUNCATE? Which one can be rolled back? Query vs Sub-query. What is RIGHT OUTER JOIN? Round4 (C4E Round) Questions: What are the services cloud offers? How to shift on-premise app to cloud? What are all authentication techniques u have worked? And how did u implement? How will you find duplicate characters in a string? What are the different types of microservice architecture? Topic vs Queue. What approach you will take to design application which may receive heavy traffic at some times? How to ensure fault tolerance? What are things inside devops? How does it work? Round 5: CEO Round Questions: When to use HTTP API vs JMS Queue? What is dead letter queue? What is meaning of http status code 401 & 403? What are the types of authentication that u use in http api? Encoding vs encryption. What is WSDL? Why do we need that? etc

Liked the chatbot notifications during hiring process. First round was smooth. Panel was very knowledgeable and was stressing on concepts and attitude. It went well and round two was scheduled for next week and it got postponed week after week for 3 weeks. Finally it happened. Since the interview was virtual, panel's background was very noisy. He was very arrogant and he was expecting whatever he knows to be known by me. You can't expect people to know everything and it's ok to not know something. Panel can't tell why u don't know this. Advise to company people to not send such people for interviews. They demoralize people. If you don't offer job, it's ok. But behave well. Apisero is a great growing company but people like this are bringing its standard down by giving bad perception to others. Also recruiter throws a lot attitude. CEO Mr. Vijay Rao, please fix such issues in future sir. Have a lot of respect for you.