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System Design Case Studies Tracker

11 case studies from Microsoft tagged Real-time with full breakdowns.

176case studies
30companies
31topics
~5 minaverage read
Push Notification Service
17 min readReal-timeMessagingDistributed Systems
Advanced+5▶ Mock
Messenger App
9 min readReal-timeMessagingDistributed Systems
Advanced+5▶ Mock
BookMyShow
9 min readDistributed SystemsPaymentsBooking System
Beginner▶ Mock
Ad Click and Impression Aggregator
6 min readAdsAnalyticsData Pipelines
Advanced+2▶ Mock
ChatGPT-Style Conversational AI Service
7 min readAI / MLReal-timeDistributed Systems
Advanced+2▶ Mock
IoT / Sensor Telemetry Pipeline
7 min readIoTData PipelinesStorage
Intermediate+1▶ Mock
Live Comments for Live Video (Facebook Live / TikTok Live)
6 min readReal-timeMessagingDistributed Systems
Intermediate▶ Mock
Metrics Monitoring and Alerting System
7 min readObservabilityData PipelinesStorage
Advanced+3▶ Mock
Online Chess Platform (chess.com)
6 min readReal-timeDistributed SystemsMessaging
Intermediate▶ Mock
To-Do List Service (REST API and Real-Time Shared Lists)
5 min readAPI DesignReal-timeCollaboration
Beginner▶ Mock
Top-K Trending Items (Heavy Hitters)
7 min readAnalyticsReal-timeAlgorithms
Advanced+4▶ Mock

Frequently Asked Questions

What are system design case studies?

System design case studies are real-world architecture problems broken down into structured breakdowns. Each case study covers requirements, high-level design, scale estimates, API designs, and deep dives into key components.

How many system design case studies should I prepare?

For FAANG interviews, preparing 15-20 case studies covering core topics like caching, load balancing, and database sharding is recommended. Focus on understanding trade-offs rather than memorizing solutions.

Which companies ask system design case studies?

All FAANG companies (Google, Amazon, Meta, Apple, Microsoft) plus top tech companies like Netflix, Uber, and Airbnb ask system design case studies. Senior-level interviews almost always include at least one system design round.

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