Questions that have appeared at Visa for an Engineering (Case Study) interview.

1. System Design

Question: How would you design a system for capturing and processing millions of transactions per second?

Question: Can you describe an effective strategy for load balancing across multiple servers to ensure high availability and reliability?

Question: How would you design a system for detecting fraudulent transactions in real-time?

2. Data Engineering

Question: How would you design a data pipeline to process large volumes of transaction data for analytics?

Question: How would you ensure data integrity and accuracy while transferring data from one system to another?

Question: How would you handle data redundancy and consistency in a distributed database system?

3. Scalability and Performance

Question: How would you improve the performance of a slow, data-intensive application?

Question: How would you design a system to be highly scalable, especially during peak load times?

Question: How would you approach a situation where a system's performance is degrading due to increasing user base and data volume?

4. Security

Question: How would you design a secure system to store and process sensitive customer data like credit card details?

Question: How would you mitigate the risks associated with data breaches and cyber attacks?

Question: What precautions would you take to ensure data privacy when designing a system for processing transaction data?