advanced~4h
System Design — Caching Patterns & CQRS
System design patterns for caching and data consistency are essential for senior engineering interviews. Understanding when and how to apply each pattern separates junior from senior engineers.
Learning objectives
- Distinguish cache-aside, write-through, and write-behind caching strategies by exactly when the cache is populated relative to a write.
- Explain what cache invalidation problem each caching strategy is more or less prone to.
- Explain what CQRS actually separates, and identify a concrete scenario where that separation solves a real problem a single model doesn't.
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System Design — Caching Patterns & CQRS