Design a scalable Order Processing System
Last updated: December 19, 2025
Quick Overview
Design a scalable order processing system handling millions of requests. Discuss consistency, availability, and performance trade-offs.
Walmart
System Design
Software Engineer
Walmart
December 19, 2025Software Engineer
Onsite
System Design
Medium
210
12
308 solved
Design a scalable order processing 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:
- Order Creation: Customers can place orders for products, including selection of items, quantities, and payment options.
- Order Status Tracking: Customer...
Capacity Estimation
- Assumptions:
- Walmart handles approximately 100 million online transactions per day during peak seasons.
- Each order consists of an average of 3 items.
- Each transaction requires 5 i...
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