TOPIC

Messaging System Design Case Studies

InterviewSkool tracks 10 Messaging case studies with architecture diagrams, scale estimates, and deep dives.

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Companies

MessagingClear all
Push Notification Service
17 min readReal-timeMessagingDistributed Systems
Advanced+5▶ Mock
Messenger App
9 min readReal-timeMessagingDistributed Systems
Advanced+5▶ Mock
ChatGPT-Style Conversational AI Service
7 min readAI / MLReal-timeDistributed Systems
Advanced+2▶ Mock
Coffee Ordering System with Real-Time Notifications
6 min readE-commerceReal-timeAPI Design
Beginner▶ Mock
Cross-Region Event Processing Platform
4 min readEvent DrivenDistributed SystemsMessaging
Advanced▶ Mock
Live Comments for Live Video (Facebook Live / TikTok Live)
6 min readReal-timeMessagingDistributed Systems
Intermediate▶ Mock
Real-Time Online Auction (eBay / Live Auctions)
7 min readReal-timeDistributed SystemsPayments
Advanced▶ Mock
Online Chess Platform (chess.com)
6 min readReal-timeDistributed SystemsMessaging
Intermediate▶ Mock
Pub/Sub System with Replay (Seek Back in Time)
3 min readMessagingDistributed SystemsStorage
Advanced▶ Mock
Stock Price Alert System
3 min readFintechReal-timeAlgorithms
Intermediate▶ Mock

Frequently Asked Questions

What is Messaging in system design?

Messaging is a core system design topic covered in 10 case studies on InterviewSkool. It appears frequently in FAANG interviews, especially at Google, Amazon, and Meta.

How should I prepare Messaging 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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