Online Round - DS questions

Tech I - Basic Java 8 questions and problem-solving.

Tech II - In-depth Java questions and questions on my current application architecture.

HR round - Cultural fit questions and about past experiences.

Round I: Online Coding

1. Valid curly braces in the given program.
2. Return frequency list on the input of a list of strings.
3. Validate password with error code.

Round II: Tech I

1. Write a lambda function to print numbers 1-5.
2. Why ArrayList?
3. Explain about the pipeline process.
4. What are the testing libraries you have used?
5. Process of code review in your application?
6. How routing works in React?
7. How indexing works in a table?
8. Do you know about EC2 configurations?
9. Biggest escalations you have faced?

Round III: Tech II

1. Scopes of a bean.
2. What is the ideal scope of a bean we can use for an e-commerce site?
3. What is the ideal storage place for storing a wishlist?
4. How can we design architecture for Redis cache if we have 4 app servers?
5. We have a file of a million lines; in each line, only one character was there. Get the frequency count.
6. Same above scenario, write a query for that.
7. SOLID principles.
8. Liskov Substitution principle example.
9. Builder design pattern.
10. Payment transaction management in your application.