Design Monitoring Infrastructure for global users
Last updated: December 7, 2025
Quick Overview
Design a event-driven monitoring system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Tesla
System Design
Software Engineer
Tesla
December 7, 2025Software Engineer
System Design Round
System Design
Hard
4
11
4,860 solved
Design a event-driven monitoring system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
System design interviews at Tesla 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
Failure handling and fault tolerance
Requirements gathering and capacity estimation
Load balancing and horizontal scaling
Partitioning and sharding strategies
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 optimize costs as the system scales?
- How would you implement rate limiting to protect the system?
- How would you handle schema migrations with zero downtime?
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Requirements
Functional Requirements
- Event Ingestion: The system must handle millions of monitoring events per second from Tesla vehicles and infrastructure globally.
- Real-time Processing: Proces...
Capacity Estimation
Back-of-Envelope Calculations
- Event Rate: Assume 1 million Tesla vehicles, each generating 10 events per minute.
- Total Events: 1,000,000 vehicles * 10 events/min = 10 million events/mi...
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