System Design Interview Crash Course
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Design Typeahead/Autocomplete

Here is the step-by-step system design for a Typeahead (Autocomplete) system.

1. Problem Definition and Scope

We are designing a real-time suggestion system similar to the search bar on Google or Amazon. As a user types a query, the system predicts and displays a list of the most likely completed search terms to save the user time.

  • User Groups:

    • Searchers: End-users typing in the search box who need instant feedback.

    • Data Analytics: Background processes that analyze search history to determine which terms are popular.

  • Main Actions:

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