Design a Rate Limiting Service
Last updated: August 14, 2025
Quick Overview
Design a distributed rate limiting system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Airbnb
August 14, 2025272
3
3,857 solved
Design a distributed rate limiting system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
This fundamentals question from Airbnb's Technical Screen tests whether you can reason about software design at a deep level. The interviewer expects discussion of maintainability, testability, and operational considerations.
What the Interviewer Expects
- Design a complex system component applying multiple engineering principles
- Reason about system-level trade-offs: performance, reliability, developer experience
- Discuss advanced patterns: event sourcing, CQRS, distributed transactions
- Address cross-cutting concerns: observability, security, backward compatibility
- Demonstrate depth in both theoretical foundations and practical implementation
Key Topics to Cover
How to Approach This
- Apply SOLID principles. Single Responsibility makes code testable, Open/Closed makes it extensible.
- Choose data structures based on access patterns, not familiarity.
- Prefer immutable data and message passing over shared mutable state for concurrency.
- Design APIs with RESTful conventions, versioning, meaningful errors, and pagination from day one.
Possible Follow-up Questions
- How would you handle backward compatibility?
- How would you document this for other engineers?
- How would this design change if the team size doubled?
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Core Design Principles
For the rate limiting service, several core design principles apply:
- Single Responsibility Principle (SRP): Each component of the system should have a single responsibility. For instance, separ...
Architecture
The architecture for the rate limiting service should be designed as a microservices-based system. Here’s a specific approach:
- Distributed Service: Each instance of the rate limiter runs indepen...
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