Initially communicated by HR which was basically a phone screening on the job description. Then had first phone interview with the Staff Engineer of the specific team.Questions started with general questions on Java such as Hashmap vs Hashtable, usage of synchronization in Java etc and then followed by a coding question. Write a function which takes an array of integers and outputs the array with all odd integers followed by the even integers. 2nd Phone interview: Debugging question on Reversing a linked list. Code was given and I was asked to find error. Onsite Interview: Implement a circular queue. Follow up question: How to make it thread-safe Given a binary tree output should be the mirror image(left child and right child of each node interchanged) of the binary tree. Debugging question on a Producer Consumer problem. Function to find str1 in a string str2 (should return true even if all the chars in str1 are present in non contiguous order in str2)

It was a frontend interview on hackerrank platform. There was three screens for html, css and JavaScript, asked to create a navigation component. HR informed me that it was going to be a data structures round with no language restriction. But in interview I found out it was a core skills round instead.