Design a fault-tolerant Payment System
Last updated: September 26, 2025
Quick Overview
Design a fault-tolerant payment system handling millions of requests. Discuss consistency, availability, and performance trade-offs.
Walmart
System Design
Software Engineer
Walmart
September 26, 2025Software Engineer
System Design Round
System Design
Easy
791
12
2,293 solved
Design a fault-tolerant 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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Requirements
- Functional Requirements:
- Process payment transactions for purchases made in-store and online.
- Support multiple payment methods (credit/debit cards, digital wallets, gift cards).
- Impl...
Capacity Estimation
To estimate the capacity needed for the payment system:
- User Base: Assume 50 million active users.
- Transaction Rate: Assume an average of 5 transactions per user per day.
- Peak Load: ...
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