Focusing on "Fan-out" patterns and read-heavy optimization (e.g., Design Twitter).
Choosing between SQL and NoSQL based on the relationship of the data. High-Level Design: Mapping the core flow of data. Design Facebook Messenger).
You must be able to explain concepts like , Consistent Hashing , and Database Indexing without hesitation. These are the building blocks of every system. 2. Mock Interviews are Essential Design Facebook Messenger).
Focusing on consistency and large binary data (e.g., Design Google Drive). Design Facebook Messenger).
Focusing on low latency and web sockets (e.g., Design Facebook Messenger).