Design a real-time chat system with hot groups

Q: How do I approach System Design interview questions?

System Design questions require understanding of core concepts and practice. PracHub provides solutions with explanations to help you master system design interviews.

Q: What difficulty level is this interview question?

This is a hard difficulty System Design question, commonly asked during Onsite rounds at Airbnb.

Q: What role is this question designed for?

This question is commonly asked for Software Engineer candidates at Airbnb during technical interviews.

Question

Design a real-time chat system with hot groups

PracHub · Accepted Answer

This question evaluates system design and real-time distributed systems skills, including designing scalable chat architectures that support 1:1 and group conversations, WebSocket-based delivery and routing across multiple gateway servers, message persistence and history sync, multi-device consistency and read receipts, plus the ability to define, detect and optimize for the Top N "hot" group chats. Commonly asked to assess reasoning about high-level architecture, concrete data schema and indexing, routing and state synchronization, and availability/disaster-recovery trade-offs, it tests both conceptual understanding and practical application by requiring a clear architecture together with detailed data model and scalability/performance considerations.

Design a real-time chat system with hot groups

Quick Overview

Design a real-time chat system with hot groups

Submit Your Answer to Earn 20XP