Design a search query autocomplete system

Q: Design a search query autocomplete system

This is a System Design interview question from OpenAI for Machine Learning Engineer roles. View the full question and solution on PracHub.

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Question

Question

Design a search autocomplete system that suggests completions as the user types.

Requirements

Sub-100ms latency per keystroke.
Suggestions should be personalized and reflect trending queries.
Must handle typos and multiple languages.
Support abuse prevention (spam, offensive queries) and privacy constraints.

Deliverables

Architecture (data collection, indexing, serving), ranking strategy, caching, and evaluation metrics.

Design a search query autocomplete system

Question

Requirements

Deliverables

Solution

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