The system design interview lasted 60 minutes. The first few minutes were dedicated to introductions and clarifications, followed by a deep dive into designing a scalable system.

The interview was highly interactive, with the interviewer asking follow-up questions to gauge my thought process.

The focus was on:

• Scalability: How to handle millions of concurrent users.
• Reliability: Ensuring uptime and fault tolerance.
• Data Storage: Database selection (SQL vs. NoSQL) and caching strategies.
• Performance Optimization: Load balancing, CDN usage, and API rate limiting.
• Security Considerations: Authentication, authorization, and data encryption.