Design a high-throughput Payment System
Last updated: July 21, 2025
Quick Overview
Design a high-throughput payment system handling millions of requests. Discuss consistency, availability, and performance trade-offs.
Walmart
System Design
Product Manager
Walmart
July 21, 2025Product Manager
Onsite
System Design
Medium
620
8
287 solved
Design a high-throughput payment 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:
- Process Payments: The system must handle credit/debit card payments, digital wallets, and other payment methods.
- Transaction History: Users should be able to...
Capacity Estimation
To estimate capacity, we consider peak shopping hours during events like Black Friday:
- User Load Estimate: Assume 10 million users visiting the site with 1% attempting to make a payment simultan...
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