The fundamental difference between a Top-Level Blueprint (HLD) and a Implementation Architecture (LLD) lies in their focus. An HLD provides a general picture of the application , outlining the key parts and their connections – it's essentially the "what" and "why." Conversely, an LLD digs into the p

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 the product can tolerate. A pr