Design a real-time Recommendation System
Last updated: November 28, 2025
Quick Overview
Design a real-time recommendation system handling millions of requests. Discuss consistency, availability, and performance trade-offs.
Walmart
Software Engineering Fundamentals
Software Engineer
Walmart
November 28, 2025Software Engineer
Technical Screen
Software Engineering Fundamentals
Medium
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3,302 solved
Design a real-time recommendation system handling millions of requests. Discuss consistency, availability, and performance trade-offs.
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.
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Core Design Principles
For designing a real-time recommendation system at Walmart, we will focus on the following core design principles:
- Scalability: The system must handle millions of requests simultaneously, espec...
Architecture
The architectural approach for the recommendation system will consist of a microservices architecture that utilizes the following components:
- Data Ingestion Layer: This will consist of real-tim...
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