Design a real-time Image Processing System
Last updated: March 16, 2026
Quick Overview
Design a real-time image processing system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Slack
March 16, 202636
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2,488 solved
Design a real-time image processing system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
System design interviews at Slack 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
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 handle a 10x increase in traffic overnight?
- How would you handle a region-wide outage?
- What monitoring and alerting would you set up on day one?
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Requirements
Functional Requirements:
- Real-Time Processing: The system must process images in real time, with a target latency of under 200 milliseconds per image.
- Image Manipulations: Support ba...
Capacity Estimation
Assuming Slack processes approximately 50 million images per day:
- Daily Requests: 50 million images/day = 50,000,000 requests.
- Requests per Second (RPS): 50,000,000 requests/day / 86400 se...
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