A repeatable structure for the system design interview
Most system design interviews reward the same five moves. Practice the structure so nerves do not scramble it.
System design interviews feel open ended, but strong candidates all move through the same steps. Having a structure frees your attention for the actual tradeoffs instead of what to say next.
Start by clarifying scope and the numbers: who uses this, how much traffic, read heavy or write heavy. Sketch the core API. Draw a simple architecture that works, then name where it breaks under load. Only then reach for the scaling tools: caching, partitioning, queues, replication, each tied to a specific bottleneck you named.
Finish by stating the tradeoff you accepted and what you would monitor. Interviewers are listening for judgment, not a memorized diagram. Talking through why beats drawing a bigger picture.
Key points
- ·Clarify scope and the traffic numbers first.
- ·Start simple, then scale each named bottleneck.
- ·End on the tradeoff you accepted and what you would watch.
Sources
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