Architect a event-driven Analytics Engine
Last updated: February 10, 2026
Quick Overview
Design a event-driven analytics system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Redfin
System Design
Software Engineer
Redfin
February 10, 2026Software Engineer
System Design Round
System Design
Easy
286
3
3,139 solved
Design a event-driven analytics system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
System design interviews at Redfin typically last 45-60 minutes. You are expected to drive the conversation, starting from requirements gathering through to a detailed architecture. The interviewer will evaluate your ability to handle ambiguity and make practical engineering decisions.
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
Database selection and data modeling
Failure handling and fault tolerance
Load balancing and horizontal scaling
API design and rate limiting
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 do you ensure data consistency across multiple services?
- How would you handle a 10x increase in traffic overnight?
- How would you optimize costs as the system scales?
- How would you implement rate limiting to protect the system?
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Requirements
- Functional Requirements:
- The system must ingest event data in real-time from various sources (user interactions, property metrics, etc.).
- Provide real-time analytics dashboards with metr...
Capacity Estimation
- User Base: Assume 1 million active users on Redfin.
- Events per User: Each user generates approximately 5 events per session (searches, views, clicks).
- Sessions per Day: Assume each u...
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