Questions that have appeared at paypal for an engineering (Case Study) interview.

1. System Design

Question: How would you design a scalable, fault-tolerant payment processing system like PayPal?

Question: How would you improve the performance of a high-traffic application?

Question: How would you design a system for detecting fraudulent transactions?

2. Data Management

Question: If you were given a large dataset of user transactions, how would you go about analyzing this data to identify trends and anomalies?

Question: How would you approach designing a database schema for a complex e-commerce platform like PayPal?

Question: How would you ensure data consistency across distributed systems?

3. Security

Question: How would you ensure the security of user data and transactions in an online payment platform?

Question: What strategies would you employ to prevent data breaches?

Question: If a security breach was detected, how would you manage the incident?

4. Performance Optimization

Question: How would you optimize the performance of a distributed system that handles millions of transactions per day?

5. Scalability

Question: How would you ensure that PayPal's systems can scale to handle an increasing number of users?

6. User Experience

Question: How would you approach improving the user experience of PayPal's web and mobile applications?

7. Project Management

Question: Describe a time when you had to make a crucial decision in a project. What was the decision, and what was the outcome?

8. Testing and Quality Assurance

Question: How would you ensure the quality of a new feature prior to release?

9. Problem Solving

Question: Describe a time when you identified and solved a complex problem in a software project.

10. Teamwork

Question: Describe a time when you worked as part of a team to deliver a complex project. How did you handle disagreements or conflicts within the team?