The core separation between a Top-Level Design (HLD) and a Implementation Plan (LLD) lies in their scope . An HLD provides a broader picture of the solution, outlining the key parts and their interactions – it's essentially the "what" and "why." Conversely, an LLD delves into the precise specificati

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