Design a Inventory Management for Visa
Last updated: November 19, 2025
Quick Overview
Design a geo-distributed inventory management system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Visa
November 19, 20253
7
2,821 solved
Design a geo-distributed inventory management system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
This is a common system design question asked during Technical Screen at Visa. The interviewer expects you to demonstrate your ability to design large-scale distributed systems, make well-reasoned trade-offs, and communicate your thought process clearly. Visa values engineers who can think about scalability from day one.
What the Interviewer Expects
- Systematically gather requirements and estimate capacity (QPS, storage, bandwidth)
- Design a scalable architecture with clear component responsibilities
- Make well-reasoned database and caching decisions with trade-off analysis
- Address consistency vs availability trade-offs specific to the use case
- Discuss partitioning strategy, replication, and data modeling
- Cover failure handling, monitoring, and alerting strategies
Key Topics to Cover
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.
Possible Follow-up Questions
- How would you migrate from a monolithic to a microservices architecture?
- What happens if one of your database nodes goes down?
- How would you implement rate limiting to protect the system?
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Requirements
Functional Requirements
- Inventory Tracking: Ability to add, update, and delete inventory items.
- Geo-Distribution: Support for multiple regions to manage inventory based on geographic...
Capacity Estimation
Assuming Visa operates in multiple regions and serves millions of transactions:
- QPS (Queries Per Second):
- Average daily transactions: 10 million
- Assume peak hours (3 hours) handle 50% o...
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