Architect a fault-tolerant Inventory Management Engine
Last updated: December 23, 2025
Quick Overview
Design a fault-tolerant inventory management system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Shopify
December 23, 202510
10
4,010 solved
Design a fault-tolerant inventory management system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
ML system design at Shopify goes beyond model selection. This System Design Round question evaluates your ability to design end-to-end ML pipelines, from data collection to model serving, while considering production constraints like latency and reliability.
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
- What is your model retraining strategy?
- What would you do if model performance degrades over time?
- How would you handle the cold start problem?
- How would you debug a model that works well offline but poorly online?
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Requirements
Functional Requirements:
- Real-time Inventory Updates: The system must allow merchants to update inventory levels in real-time as purchases are made.
- Multi-Location Support: Support for...
Capacity Estimation
Assuming Shopify has approximately 1 million merchants, and each merchant has an average of 100 SKUs:
- Total SKUs: 1 million merchants * 100 SKUs = 100 million SKUs.
- Requests per Day: If ea...
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