Design a high-throughput Recommendation System
Last updated: March 18, 2026
Quick Overview
Design a high-throughput recommendation system handling millions of requests. Discuss consistency, availability, and performance trade-offs.
Walmart
System Design
Software Engineer
Walmart
March 18, 2026Software Engineer
Onsite
System Design
Medium
530
9
4,578 solved
Design a high-throughput recommendation system handling millions of requests. Discuss consistency, availability, and performance trade-offs.
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.
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Practice System Design ProblemsSample Answer
Requirements
Functional Requirements
- User Personalization: Provide personalized product recommendations based on user behavior and preferences.
- Real-time Updates: Recommendations should reflect r...
Capacity Estimation
Assuming Walmart has around 300 million unique users and an average of 5 recommendations requested per user per day:
- Daily Requests: 300 million users * 5 requests = 1.5 billion requests/day
- ...
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