The core separation between a High-Level Design (HLD) and a Implementation Design (LLD) lies in their breadth . An HLD provides a general view of the application , outlining the major parts and their connections – it's essentially the "what" and "why." Conversely, an LLD goes into the granular sp

Caching Strategies Start With One Question: How Stale Can This Data Be? Most caching answers jump straight to Redis. The stronger answer starts one step earlier. Caching is a deliberate trade of freshness for speed, so the first thing to establish is how much staleness t