Design a scalable Analytics System
Last updated: November 30, 2025
Quick Overview
Design a scalable analytics system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Neon
November 30, 2025239
6
2,876 solved
Design a scalable analytics system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Neon asks this during the System Design Round to assess your understanding of the full ML lifecycle. They want to see how you translate a business problem into an ML objective, design the feature pipeline, and plan for model monitoring and retraining.
What the Interviewer Expects
- Map the business problem to a concrete ML objective
- Propose reasonable features and a baseline model
- Discuss basic model evaluation metrics
- Outline a simple serving architecture
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 run A/B tests on different model versions?
- How would you ensure fairness and reduce bias in the model?
- 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
- Data Ingestion: The system should be able to ingest millions of data points per day from various sources such as user interactions, transactions, and external APIs. ...
Capacity Estimation
Assuming Neon serves 1 million users with an average of 100 interactions per user per day:
- Daily Interactions: 1,000,000 users * 100 interactions = 100,000,000 interactions per day.
- **Real-tim...
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