After the high-level design, your interviewer will probe - components. This is where you show depth.
Common topics for detailed exploration:
- Database schema and indexing
- Caching strategy and invalidation
- How you handle failures
- How you scale a bottleneck
When your interviewer asks "How would you scale this?", don't just say "add more servers." Explain: horizontal scaling, sharding strategy, read replicas, cache warming.
This is where / candidates separate from .