Round 1: Hacker rank round: I don’t remember the questions.
Round 2: Technical Round
- Brief Intro
- Given an unsorted array arr of size N of positive integers. One number ‘A’ from set {1, 2, …N} is missing and one number ‘B’ occurs twice in the array. Find these two numbers.
- You are given N elements and your task is to Implement a Stack in which you can get minimum element in O(1) time.
Round 3:System Design
- Brief intro,
- Have you worked on Multi-Threading
- Producer-Consumer Model
- Method of threads
- How to wait and notify different from sleep
- How to make a class immutable, give an example transaction
- Transaction related question from Spring
- What is spring AOP, type of AOP
- Internal Working of HashMap
- What is Optional, why it is used
- Difference between Abstraction and interface, Give a real-life example
- Any design pattern used -> Factory pattern lld
- HLD -> design an e-commerce application like amazon Flipkart
Round 4:Techno Managerial Round
- The description is given by Director on Paypal, project scope, and tech stack
- Detailed discussion on experience, all projects
- Behavioral questions
- Best learning so far
- new tech stack learned
- Team structure
- How SDLC is followed
- Coding question
- How to make a class immutable, give an example
- Use of static, final
- Design a class Age Calculator with all corner cases covered which take input dob and return age.
- Make AgeCalculator immutable.
- Design your hashmap, in which we can use all hashmap functions, but double size should be returned. -> use composition
- Design Rubix cube as a real-life entity.
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