Build a multi-tenant Recommendation Pipeline
Last updated: May 6, 2026
Quick Overview
Design a multi-tenant recommendation system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Microsoft
May 6, 202641
7
4,390 solved
Design a multi-tenant recommendation system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Microsoft asks this during the Technical Screen 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 monitoring and alerting would you set up on day one?
- How do you ensure data consistency across multiple services?
- How would you handle a region-wide outage?
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Requirements
Functional Requirements
- Multi-Tenancy: The system should support multiple tenants, ensuring that data and recommendations for each tenant are isolated.
- Real-Time Recommendations: The...
Capacity Estimation
Assuming each tenant has an average of 10,000 users and there are 100 tenants:
- Total users = 1,000,000.
- If each user makes 10 requests per day, that results in 10,000,000 requests/day.
- This tran...
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