Design Search Infrastructure for IoT devices
Last updated: October 6, 2025
Quick Overview
Design a multi-tenant search system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Robinhood
October 6, 202510
6
2,418 solved
Design a multi-tenant search system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
ML system design at Robinhood 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
- Design the full ML lifecycle from data collection to model monitoring
- Address cold start, exploration/exploitation, and model freshness
- Discuss multi-objective optimization and ranking systems
- Plan for model debugging, fairness, and bias mitigation
- Design the feature store and training pipeline for scale
- Address model versioning, canary deployments, and rollback strategies
- Discuss the data flywheel and long-term system evolution
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 ensure fairness and reduce bias in the model?
- How would you handle a 10x increase in prediction requests?
- What is your model retraining strategy?
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Requirements
Functional Requirements
- Multi-tenant Architecture: Support multiple IoT devices from various tenants with isolation of data and processing.
- Search Functionality: Fast and relevant se...
Capacity Estimation
Assuming Robinhood has around 10 million IoT devices, each generating an average of 1 request per second:
- Total Requests per Second: 10 million requests.
- Daily Requests: 10 million requ...
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