System Design — Facebook Search (Mini Elasticsearch)

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Design Facebook post search — given query terms, return all matching posts. The exercise is essentially "build a mini Elasticsearch": inverted index, ranking, top-K per query, real-time ingestion.

SWE

Infra Eng

retrieval

ranking

scaling

sharding

medium

Frequency

Medium

Last asked

2026-08-20

Stage

onsite-system-design

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