Design a large-scale Feed Generation Platform
Last updated: June 12, 2026
Quick Overview
Design a fault-tolerant feed generation system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Jane Street
June 12, 202614
5
3,638 solved
Design a fault-tolerant feed generation system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
ML system design at Jane Street goes beyond model selection. This Technical Screen 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?
- How would you debug a model that works well offline but poorly online?
- How would you run A/B tests on different model versions?
- What would you do if model performance degrades over time?
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Requirements
Functional Requirements
- Data Ingestion: The system must ingest real-time data streams from various sources, including market feeds, order books, and historical data.
- Feed Generation:...
Capacity Estimation
Assuming Jane Street operates in a high-frequency trading environment, we can estimate the capacity needs:
- Number of Requests: Assuming 5 million requests per second during peak hours.
- **Data...
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