Architect a distributed Inventory Management Engine
Last updated: June 10, 2026
Quick Overview
Design a distributed inventory management system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
PlanetScale
June 10, 202632
3
927 solved
Design a distributed inventory management system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
This ML system design question from PlanetScale's Technical Screen tests your ability to think about ML systems at scale. The interviewer expects discussion of data quality, feature stores, model serving infrastructure, and A/B testing strategy.
What the Interviewer Expects
- Define clear ML objectives with appropriate loss functions and metrics
- Design a comprehensive feature engineering pipeline
- Discuss model selection with trade-offs (complexity vs interpretability vs latency)
- Plan online and offline evaluation strategies including A/B testing
- Address serving infrastructure: batch vs real-time, latency requirements
- Consider data quality, labeling strategy, and feedback loops
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 handle the cold start problem?
- How would you debug a model that works well offline but poorly online?
- How would you handle a 10x increase in prediction requests?
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Requirements
Functional Requirements
- Inventory Tracking: The system must track real-time inventory levels across multiple warehouses.
- Request Handling: Handle millions of requests per day for inv...
Capacity Estimation
Assuming the system will handle approximately 100 million requests per month:
- Daily Requests: 100 million / 30 days = ~3.33 million requests/day.
- Peak Traffic: Assuming peak times handle 2...
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