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LinkedIn System Design
Visual Problem Diagram
Scenario
A recruiter searches "VP Eng fintech Bay Area" and expects results in < 300 ms while the same user's feed shows job posts from connections who posted job ads as organic content—the interview blends professional graph, feed, and search without designing email end-to-end.
Design a professional networking platform with profiles, connections, content feed, and job/people search. Combine social feed patterns with structured professional data and search indexes.
You should support profiles, connection requests, feed, job listings search, and connection recommendations. Be ready to separate graph, feed, and search architectures.
Constraints
Profiles, connect/request, feed posts, job search, people search, recommendations, notifications hook
< 300 ms search p95, feed p95 < 400 ms, durable graph, 99.9% availability
900M members, 310M MAU, billions profile views/month, heavy read skew
Stages ahead
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