Web Search Engine

HardData • 60 minutes

Problem Statement

Design a web search engine that crawls billions of pages, builds indexes, and returns relevant results quickly. Include ranking algorithms and real-time updates.

Key Expectations

•Web crawling strategy and politeness
•Inverted index construction and storage
•PageRank and relevance scoring
•Query processing and optimization
•Real-time index updates

Key Components to Consider

Web CrawlerIndex BuilderQuery ProcessorRanking ServiceDocument Store

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Session Notes

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💡 Interview Tips

1. Clarify Requirements (5 min)

Ask about scale, features, and constraints

2. Capacity Planning (5 min)

Estimate users, data, and throughput

3. High-Level Design (15 min)

Core components and data flow

4. Deep Dive (15 min)

Critical components and APIs

5. Scale & Optimize (5 min)

Bottlenecks and solutions