The process consisted of total of 5 rounds as follows: Round 1: write a production quality code for ATM machines, which will select minimum no of currencies and we don't have infinite supply of notes. [since Indian currency, I took greedy approach ] Given a set of parenthesis find its balance or not. design a concurrent system to copy bunch of files from one server to another server. Round 2: question around java collection FW[hashmap, concurrent hash map, list ] given a linkedList which has a loop, find the starting point of the loop. Largest BST in Binary Tree Round 3: Given a string and a set of characters, return the shortest substring containing all the characters in the set. For example, given the string "figehaeci" and the set of characters {a, e, i}, you should return "aeci". Design a connection pool Round 4: Hiring manager discussion, majorly on the roles and responsibilities. Feedback of interviews. Questions a candidate can ask. More kind of casual talk. Round 5: HR round