Design a Scalable Autocomplete System

Design a Scalable Typeahead Suggestion System

Design a search autocomplete system (Typeahead) similar to Google or Amazon. The system should support 500 million daily searches with a p99 latency under 100ms. Discuss how you would store and query prefix data efficiently, how the system handles the massive write volume of search logs, and how you would ensure the suggestions remain relevant as search trends change. Focus on data structure selection, caching strategies, and the end-to-end data pipeline.
TrieRedisKafkaApache SparkAPI GatewayCDNNoSQLgRPC
10
Read

Scalable Autocomplete System for Web Search

Design a high-scale autocomplete/typeahead system similar to Google Search. The system must provide real-time suggestions (top-k) based on user prefixes with a latency under 100ms. Consider a scale of 500 million DAU and 5 billion daily queries. Discuss the trade-offs between live Trie traversal versus pre-computed storage, how to handle massive write-heavy analytics for frequency updates, and strategies for global low-latency delivery.
RedisKafkaApache SparkCassandraNoSQLCDNTrieAPI Gateway
20
Read

Design a Scalable Autocomplete System

Design a search autocomplete (typeahead) system similar to Google Search. The system must support 5 billion searches per day with sub-100ms latency. Your design should handle prefix matching, suggest the top 5 most frequent completions, and provide a mechanism for updating suggestions as new search trends emerge. Explain your choices for data structures, storage, and how you would maintain performance at peak loads of 600,000 QPS.
RedisApache KafkaApache SparkCassandraNoSQLTriegRPCAnycast DNS
00
Read
1
InterviewGPT

AI-powered tools to help you succeed in tech interviews — from resume to offer.

Interview Solver

  • Coding Puzzles
  • System Design
  • Behavioral Challenges
  • ML System Design
  • SQL Puzzles
  • FE System Design
Explore Solver

Question Bank

  • Coding Interview Questions
  • System Design Interview Questions
  • Behavioral Interview Questions
  • ML System Design Questions
  • SQL & Database Questions
  • FE System Design Questions
Explore Questions

Golden Blogs

  • Coding Solutions
  • System Design Guides
  • Behavioral Guides
  • ML System Design Guides
  • SQL Solutions
  • FE System Design Guides
Explore Blogs

Intervipedia

  • Coding Concepts
  • System Design Concepts
  • Behavioral Concepts
  • ML System Concepts
  • SQL Concepts
  • FE System Concepts
Explore Concepts

Application Tools

  • Self-Intro Generator

Company

  • Pricing
  • FAQ
  • About
  • Privacy Policy
  • Terms of Service

© 2026 InterviewGPT Inc. All rights reserved.

All systems operationalUS-East

Made with ♥ for developers