Design a fault-tolerant Inventory Management System
Last updated: January 25, 2026
Quick Overview
Design a fault-tolerant inventory management system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Cruise
January 25, 20265
9
1,350 solved
Design a fault-tolerant inventory management system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Cruise asks this during the Onsite to assess your architectural thinking. They want to see how you decompose a complex problem, choose appropriate technologies, and reason about failure modes. Strong candidates proactively discuss monitoring, alerting, and operational concerns.
What the Interviewer Expects
- Clearly define functional and non-functional requirements
- Propose a reasonable high-level architecture with core components
- Choose appropriate data storage solutions with basic justification
- Discuss basic scaling strategies (horizontal scaling, caching)
- Identify potential bottlenecks and suggest simple solutions
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
- What would the deployment pipeline look like for this system?
- How would you handle schema migrations with zero downtime?
- How would you optimize costs as the system scales?
- How would you implement rate limiting to protect the system?
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Requirements
- Functional Requirements:
- Inventory Tracking: Ability to track inventory levels of various products in real-time.
- CRUD Operations: Support for Create, Read, Update, and Delete o...
Capacity Estimation
Assuming Cruise handles around 10 million inventory transactions per month:
- Average 300,000 transactions per day, which translates to approximately 3.5 transactions per second.
- If each transaction...
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