•TOPIC
Real-time System Design Case Studies
InterviewSkool tracks 51 Real-time case studies with architecture diagrams, scale estimates, and deep dives.
Filter by company to see which companies ask Real-time questions, or browse all case studies.
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Companies
Topics
✓ 0Case studiesDifficultyAsked atPractice
Beginner

Beginner
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Advanced


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User Behavior Tracking (Clickstream Analytics)
Intermediate6 min readAnalyticsData PipelinesReal-time
Real-Time Collaborative Editor (Google Docs / Sheets)
Advanced7 min readCollaborationReal-timeDistributed Systems
Advanced
Beginner
Advanced
Intermediate
Food and Quick-Commerce Delivery Platform (Uber Eats / DoorDash)
Advanced6 min readGeospatialReal-timeE-commerce
Intermediate
Intermediate


+1
Live Comments for Live Video (Facebook Live / TikTok Live)
Intermediate6 min readReal-timeMessagingDistributed Systems
Advanced
Real-Time Market Data Distribution and VWAP (Bloomberg)
Advanced5 min readFintechReal-timeDistributed Systems
Streaming Mention Analytics with Search and Alerts (Bloomberg)
Advanced3 min readReal-timeSearchAnalytics
Advanced


+3
Real-Time Online Auction (eBay / Live Auctions)
Advanced7 min readReal-timeDistributed SystemsPayments
Intermediate


Online Judge and Coding Contest Platform (LeetCode)
Intermediate6 min readDistributed SystemsSecurityScheduling
Perishable-Goods Inventory and Location Tracking
Intermediate3 min readE-commerceDatabasesEvent Driven
"Played by Your Friends" Social Summary (Roblox)
Intermediate3 min readDistributed SystemsCachingReal-time
Advanced
Intermediate

Security Monitoring Framework for Cloud Infrastructure
Advanced4 min readSecurityObservabilityData Pipelines
Data Engineering for a Short-Video App (TikTok-scale)
Advanced4 min readData PipelinesAnalyticsStorage
Intermediate
Advanced



Advanced
To-Do List Service (REST API and Real-Time Shared Lists)
Beginner5 min readAPI DesignReal-timeCollaboration
Advanced


+4
User Activity Collection and Recent-Window Queries
Intermediate5 min readAnalyticsData PipelinesStorage
Intermediate
Advanced
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.
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