Build a low-latency Inventory Management Pipeline
Last updated: October 10, 2025
Quick Overview
Design a low-latency inventory management system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
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Design a low-latency inventory management system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
System design interviews at LinkedIn 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
- 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 implement rate limiting to protect the system?
- How would you optimize costs as the system scales?
- What happens if one of your database nodes goes down?
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Requirements
Functional Requirements
- User Management: Users (employees) should be able to view, add, update, and delete inventory items.
- Real-Time Updates: Changes to inventory must be reflected ...
Capacity Estimation
Assuming LinkedIn has 700 million members and a significant portion uses the inventory system daily, let's estimate:
- Daily Active Users (DAU): 1% of 700 million = 7 million users.
- **Requests p...
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