Design a Inventory Management Service
Last updated: May 2, 2026
Quick Overview
Design a distributed inventory management system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
SentinelOne
May 2, 202638
12
4,621 solved
Design a distributed inventory management system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
System design interviews at SentinelOne typically last 45-60 minutes. You are expected to drive the conversation, starting from requirements gathering through to a detailed architecture. The interviewer will evaluate your ability to handle ambiguity and make practical engineering decisions.
What the Interviewer Expects
- Drive the design discussion proactively with minimal interviewer guidance
- Perform detailed capacity estimation and use it to inform design decisions
- Design for global scale with multi-region deployment and data consistency
- Deep dive into 2-3 critical components with implementation-level detail
- Address complex trade-offs: CAP theorem, eventual consistency, conflict resolution
- Discuss operational excellence: deployment strategy, chaos engineering, SLOs/SLIs
- Propose a phased rollout plan from MVP to full-scale system
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 monitoring and alerting would you set up on day one?
- What would the deployment pipeline look like for this system?
- How would you implement rate limiting to protect the system?
- How would you optimize costs as the system scales?
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Requirements
Functional Requirements:
- Inventory Tracking: Ability to track inventory levels in real-time across multiple regions.
- Order Processing: Process incoming orders, updating inventory lev...
Capacity Estimation
Assuming SentinelOne operates in multiple regions with a user base of around 10 million users:
- Traffic Per User: Estimate 5 requests per user per day, resulting in 50 million requests daily. 2....
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