Design a Chat Service
Last updated: June 6, 2026
Quick Overview
Design a scalable chat system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Apple
System Design
Product Manager
Apple
June 6, 2026Product Manager
Technical Screen
System Design
Hard
57
11
380 solved
Design a scalable chat system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
System design interviews at Apple typically last 45-60 minutes. You are expected to drive the conversation, starting from requirements gathering through to a detailed architecture. The interviewer will evaluate your ability to handle ambiguity and make practical engineering decisions.
What the Interviewer Expects
- Drive the design discussion proactively with minimal interviewer guidance
- Perform detailed capacity estimation and use it to inform design decisions
- Design for global scale with multi-region deployment and data consistency
- Deep dive into 2-3 critical components with implementation-level detail
- Address complex trade-offs: CAP theorem, eventual consistency, conflict resolution
- Discuss operational excellence: deployment strategy, chaos engineering, SLOs/SLIs
- Propose a phased rollout plan from MVP to full-scale system
Key Topics to Cover
Monitoring, logging, and alerting
Security and authentication
Requirements gathering and capacity estimation
Load balancing and horizontal scaling
High-level architecture and component design
Failure handling and fault tolerance
How to Approach This
- Start by clarifying functional and non-functional requirements with the interviewer.
- Estimate the scale: QPS, storage, bandwidth. This drives your design decisions.
- Draw a high-level architecture first, then deep dive into 1-2 critical components.
- Discuss trade-offs explicitly (e.g., consistency vs availability, SQL vs NoSQL).
- Address failure scenarios, monitoring, and how the system handles 10x traffic spikes.
Possible Follow-up Questions
- How would you implement rate limiting to protect the system?
- How would you optimize costs as the system scales?
- How would you handle a 10x increase in traffic overnight?
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Requirements
Functional Requirements
- User Authentication: Users must be able to register, log in, and manage their profiles securely.
- Real-time Messaging: Support sending and receiving messages i...
Capacity Estimation
Capacity Estimation
- User Base: Assume 100 million active users.
- Messages Per User: Estimate an average of 10 messages sent per user per day.
- Total Messages: 100 million users ...
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