Design a large-scale Rate Limiting Platform
Last updated: February 27, 2026
Quick Overview
Design a multi-tenant rate limiting system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Scale AI
February 27, 2026108
8
1,714 solved
Design a multi-tenant rate limiting system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Scale AI asks this during the Onsite to assess your understanding of the full ML lifecycle. They want to see how you translate a business problem into an ML objective, design the feature pipeline, and plan for model monitoring and retraining.
What the Interviewer Expects
- Design the full ML lifecycle from data collection to model monitoring
- Address cold start, exploration/exploitation, and model freshness
- Discuss multi-objective optimization and ranking systems
- Plan for model debugging, fairness, and bias mitigation
- Design the feature store and training pipeline for scale
- Address model versioning, canary deployments, and rollback strategies
- Discuss the data flywheel and long-term system evolution
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 handle the cold start problem?
- How would you run A/B tests on different model versions?
- How would you ensure fairness and reduce bias in the model?
- What would you do if model performance degrades over time?
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Requirements
Functional Requirements
- Multi-Tenant Support: The platform must support multiple clients, allowing each to define their own rate limits and configurations.
- Dynamic Rate Limiting: Abi...
Capacity Estimation
Assuming Scale AI has 1000 tenants, each with an average of 500 active users, resulting in:
- Total Users: 500,000
- Requests per User: 100 requests per minute (average)
- **Total Requests pe...
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