Design a multi-tenant Logging System
Last updated: April 5, 2026
Quick Overview
Design a multi-tenant logging system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
SpaceX
System Design
Software Engineer
SpaceX
April 5, 2026Software Engineer
Technical Screen
System Design
Medium
19
13
2,209 solved
Design a multi-tenant logging system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
System design interviews at SpaceX 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
Failure handling and fault tolerance
Security and authentication
High-level architecture and component design
Message queues and async processing
Load balancing and horizontal scaling
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?
- What monitoring and alerting would you set up on day one?
- How would you implement rate limiting to protect the system?
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Requirements
Functional Requirements
- Multi-tenant Support: The system must support multiple clients (e.g., different SpaceX teams) with data isolation.
- Real-time Logging: Logs should be ingested ...
Capacity Estimation
Back-of-Envelope Calculations
- Log Generation: Assume each SpaceX team generates 1,000 log events per second (EPS). With 50 teams, this leads to a total of:
- 50,000 EPS
- **Storage Require...
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