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Interview prep

Practice what actually gets asked.

Questions people reported after real interviews, curated sets for each role, and feedback that tells you the one thing to fix next.

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System designMost asked · reported by 38 peopleEarly career, experienced

Design a URL shortener that handles 10,000 writes a second.

Separate the write path (generate an ID, store the mapping) from the read path, which is 100× hotter. Base62 IDs from a counter service, a key-value store for mappings, and a cache in front of reads…
AI draft · feedback
  • StrengthYou split read and write paths before choosing a store, and sized the read load.
  • GapYou didn't say how cached links are invalidated when one is deleted or expires.
  • NextRead “Caching basics”, 8 min.
AcceptEditThis was wrong

Every question shows its source.

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  1. 01

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