Search Autocomplete at 10ms Latency

System Design diagram · made in Skemio

System architecture diagram of a search autocomplete engine showing API gateway, Redis prefix cache, Trie service, and analytics aggregation pipeline.

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What it shows

Prefix tries match input strings in O(L) time, strictly bounded by query length.
Storing pre-computed Top-K lists at trie nodes removes expensive sort queries.
Redis caches hot prefix branches in-memory to keep p99 latency below 10ms.

The takeaway

Pre-aggregate top suggestions at trie branch nodes so reads require zero runtime sorting.

#SystemDesign
#SearchEngine
#Backend
#Redis
#DataStructures
#SoftwareEngineering

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