Design a Monitoring for Apple
Last updated: March 22, 2026
Quick Overview
Design a real-time monitoring system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Apple
March 22, 2026124
13
222 solved
Design a real-time monitoring 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
- Systematically gather requirements and estimate capacity (QPS, storage, bandwidth)
- Design a scalable architecture with clear component responsibilities
- Make well-reasoned database and caching decisions with trade-off analysis
- Address consistency vs availability trade-offs specific to the use case
- Discuss partitioning strategy, replication, and data modeling
- Cover failure handling, monitoring, and alerting strategies
Key Topics to Cover
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 migrate from a monolithic to a microservices architecture?
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Requirements
Functional Requirements
- Real-time Data Ingestion: The system should accept millions of telemetry data points per second from various Apple devices and services.
- **Dashboard and Visualiza...
Capacity Estimation
To estimate capacity, we consider the following:
- Data Ingestion Rate: Assuming 1 million devices each sending data every second, we need to handle approximately 1 million QPS (queries per secon...
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