Design a File Storage for Pinterest
Last updated: July 12, 2025
Quick Overview
Design a low-latency file storage system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
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Design a low-latency file storage 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 Pinterest. 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. Pinterest 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
- What would the deployment pipeline look like for this system?
- How would you handle schema migrations with zero downtime?
- How would you optimize costs as the system scales?
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Requirements
Functional Requirements
- File Upload: Users must be able to upload images and videos.
- File Retrieval: Users must be able to retrieve and view their uploaded files quickly.
- **File M...
Capacity Estimation
To estimate the capacity for our file storage system, we will consider the following metrics:
- Users: Assume Pinterest has 400 million active users.
- Uploads Per User: Let's estimate an ave...
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