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Must-Know Concepts for System Design Interviews
Last Updated: January 9, 2026
Ashish Pratap Singh
High Priority
27 min read
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1. Scalability
2. Databases
3. Caching
4. Messaging and Asynchronous Communication
5. Networking Fundamentals
6. Reliability and Fault Tolerance
7. Consistency and CAP Theorem
8. API Design
9. Back-of-Envelope Estimation
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