Design a real-time File Storage System
Last updated: May 2, 2026
Quick Overview
Design a real-time file storage system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Shopify
May 2, 202635
4
4,442 solved
Design a real-time file storage system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
This fundamentals question from Shopify's Technical Screen tests whether you can reason about software design at a deep level. The interviewer expects discussion of maintainability, testability, and operational considerations.
What the Interviewer Expects
- Explain the concept clearly with a practical example
- Discuss when and why to apply this principle
- Identify common mistakes and anti-patterns
- Compare with alternative approaches
Key Topics to Cover
How to Approach This
- Apply SOLID principles. Single Responsibility makes code testable, Open/Closed makes it extensible.
- Choose data structures based on access patterns, not familiarity.
- Prefer immutable data and message passing over shared mutable state for concurrency.
- Design APIs with RESTful conventions, versioning, meaningful errors, and pagination from day one.
Possible Follow-up Questions
- How would this design change if the team size doubled?
- What are the security implications of this design?
- How would you measure the performance of this component in production?
- How would you handle backward compatibility?
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Core Design Principles
For the real-time file storage system, the SOLID principles are crucial. Specifically, the Single Responsibility Principle applies as we should separate concerns between file storage, metadata...
Architecture
A microservices architecture will be the backbone of our real-time file storage system. Each service will handle specific tasks: a file upload service, a storage service (which could utilize distr...
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