Want to become good developers? POV: You actually learn the most used system design concepts instead of just grinding LeetCode. Here’s what real backend & system design interviews test you on: ⸻ 1️⃣ Caching Understand cache patterns, invalidation, eviction, write-through vs write-back. 2️⃣ Load Balancing Round robin, consistent hashing, scaling horizontally. 3️⃣ SQL vs NoSQL When to choose relational vs document vs key-value stores. 4️⃣ Database Scaling Vertical vs horizontal scaling, bottlenecks. 5️⃣ Database Sharding Partitioning data to handle massive traffic. 6️⃣ Indexing B-Trees, inverted indexes, query optimization. 7️⃣ Database Replication Leader-follower, async vs sync replication. 8️⃣ Data Consistency Strong vs eventual consistency. Trade-offs matter. 9️⃣ API Gateway Single entry point for microservices. 🔟 CAP Theorem Consistency vs Availability vs Partition Tolerance. 1️⃣1️⃣ Microservices Architecture When to break the monolith. 1️⃣2️⃣ CDN (Content Delivery Ne...