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Real-time System Design Case Studies

8 Real-time case studies from Uber with full breakdowns.

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Gaming Leaderboard (Top K)
16 min readDistributed SystemsReal-timeStorage
Beginner▶ Mock
Messenger App
9 min readReal-timeMessagingDistributed Systems
Advanced+5▶ Mock
Uber Design (Ride-Hailing)
5 min readGeospatialReal-timeDistributed Systems
Advanced+2▶ Mock
User Behavior Tracking (Clickstream Analytics)
6 min readAnalyticsData PipelinesReal-time
Intermediate▶ Mock
Daily Puzzle Platform (Wordle-style)
3 min readAPI DesignCachingDatabases
Beginner▶ Mock
Stock Price Alert System
3 min readFintechReal-timeAlgorithms
Intermediate▶ Mock
Stock Trading Platform (Zerodha / Robinhood)
6 min readFintechPaymentsReal-time
Advanced▶ Mock

Frequently Asked Questions

What is Real-time in system design?

Real-time is a core system design topic covered in 51 case studies on InterviewSkool. It appears frequently in FAANG interviews, especially at Google, Amazon, and Meta.

How should I prepare Real-time for system design interviews?

Study the case studies above, focusing on architecture trade-offs, scale estimates, and API designs. Practice explaining your decisions aloud — this is exactly what interviewers evaluate.

Practice with a Mock Interview

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