Build a distributed Rate Limiting Pipeline
Last updated: April 7, 2026
Quick Overview
Design a distributed rate limiting system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Tesla
System Design
Software Engineer
Tesla
April 7, 2026Software Engineer
Onsite
System Design
Easy
3
12
55 solved
Design a distributed rate limiting system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Tesla asks this during the Onsite to assess your architectural thinking. They want to see how you decompose a complex problem, choose appropriate technologies, and reason about failure modes. Strong candidates proactively discuss monitoring, alerting, and operational concerns.
What the Interviewer Expects
- Clearly define functional and non-functional requirements
- Propose a reasonable high-level architecture with core components
- Choose appropriate data storage solutions with basic justification
- Discuss basic scaling strategies (horizontal scaling, caching)
- Identify potential bottlenecks and suggest simple solutions
Key Topics to Cover
Database selection and data modeling
High-level architecture and component design
API design and rate limiting
Security and authentication
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 optimize costs as the system scales?
- How would you handle schema migrations with zero downtime?
- How would you implement rate limiting to protect the system?
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Requirements
- Functional Requirements:
- Support rate limiting for different APIs (e.g., vehicle orders, service requests).
- Configurable rate limits based on user roles (admin, regular user, etc.)...
Capacity Estimation
To estimate capacity, we assume:
- Total Users: 1 million active users.
- Requests per User: Average of 10 requests per minute.
- Peak Load: 5x the average due to promotions, lead...
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