Interview questions :

Technical Round 1

• Find all possible pairs with given sum
• Find the right side view of a binary tree

Technical Round 2

• Breifly explain about kafka in general . Walkthrough of the terminologies that we use in kafka ? (Question was specific to me because I had projects which were using Kafka)

• What is an immutable class in java ?

• How can we make a class immutable in java ?

• How to send a clone of an object using the clone() method of the cloneable() interface ?

  • This is deep copy

• Add one to a number

• Sort an array of 0,1 and 2.

Hiring Manager Round 3

• walk me through your industry projects
• what is the most challenging problem that you solved in your industry till now ?
• why do you want to join paypal ?
• Have you been into a situation where you might have got into some argument with some of your colleagues ?
• Given a sentence, find the characters with max frequency ?
• You have to design a herirachichal database to make sure that the database is scalable and is flexible to any further requirements that might come up in future
  • How wil we design this in a relational as well as non-relational database ?
• Answer these three questions :
  • Till date, what is the most complex problem that you have solved in your industry ?
  • Why do you think it was complex ?
  • how did you solve it ?

Result : Hired !!