Design a large-scale Image Processing Platform
Last updated: September 25, 2025
Quick Overview
Design a distributed image processing system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Snapchat
September 25, 20255
7
2,812 solved
Design a distributed image processing system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
This is a common system design question asked during Technical Screen at Snapchat. The interviewer expects you to demonstrate your ability to design large-scale distributed systems, make well-reasoned trade-offs, and communicate your thought process clearly. Snapchat values engineers who can think about scalability from day one.
What the Interviewer Expects
- Systematically gather requirements and estimate capacity (QPS, storage, bandwidth)
- Design a scalable architecture with clear component responsibilities
- Make well-reasoned database and caching decisions with trade-off analysis
- Address consistency vs availability trade-offs specific to the use case
- Discuss partitioning strategy, replication, and data modeling
- Cover failure handling, monitoring, and alerting strategies
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 implement rate limiting to protect the system?
- What monitoring and alerting would you set up on day one?
- What would the deployment pipeline look like for this system?
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Requirements
- Functional Requirements:
- Process images uploaded by users, applying transformations such as filters, resizing, and compression.
- Enable real-time processing to support features like...
Capacity Estimation
Assuming Snapchat has approximately 300 million daily active users:
- QPS Estimation:
- If 10% of users upload an image daily, that equals 30 million uploads.
- If each user uploads 5 imag...
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