Architect a event-driven Rate Limiting Engine
Last updated: March 23, 2026
Quick Overview
Design a event-driven rate limiting system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Stripe
March 23, 202610
13
2,497 solved
Design a event-driven rate limiting system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
System design interviews at Stripe 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
- 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
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 schema migrations with zero downtime?
- How would you migrate from a monolithic to a microservices architecture?
- How would you handle a 10x increase in traffic overnight?
Practice a Similar Problem on Codemia
Solve a related problem with our interactive workspace, get AI feedback, and view detailed solutions.
Solve on CodemiaSample Answer
Requirements
- Functional Requirements:
- The rate limiting engine should enforce limits on API requests based on user tiers (e.g., free, pro).
- It should support both IP-based and user-based rate limitin...
Capacity Estimation
-
Traffic Estimates:
- Assume Stripe processes approximately 1 billion API requests daily.
- This translates to about 11,574 requests per second.
-
Rate Limiting Needs:
- If we apply an...
Submit Your Answer
