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

1. System Design

Question: How would you design a system that can handle Visa's high volume of transactions per second without failure?

Question: If you were tasked to redesign Visa's payment processing system, what aspects would you focus on to ensure its efficiency and reliability?

Question: What strategies would you employ to ensure data integrity and security in a system that processes millions of transactions daily?

2. Troubleshooting

Question: Imagine a scenario where Visa's transaction system suddenly goes down. Describe your approach to identifying the problem and restoring service.

Question: How would you handle a situation where there's a significant increase in transaction failure rates?

Question: In the event of a security breach, what steps would you take to mitigate the impact and prevent future occurrences?

3. Infrastructure

Question: Given Visa's global operation, how would you design the system infrastructure to ensure high availability and performance?

Question: How would you go about scaling Visa's infrastructure to handle a sudden increase in demand?

Question: What considerations would you take into account when deciding between on-premises servers and cloud-based solutions for Visa's transaction processing system?

4. Performance Optimization

Question: How would you approach improving the performance of a transaction processing system that is experiencing slow response times?

Question: What steps would you take to identify and fix performance bottlenecks in a high-traffic system like Visa's?

Question: How would you ensure that Visa's systems remain efficient and performant during peak transaction times, such as during the holiday season?