Design a large-scale File Storage Platform
Last updated: February 19, 2026
Quick Overview
Design a low-latency file storage system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
ServiceNow
February 19, 20269
4
4,610 solved
Design a low-latency file storage system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
ServiceNow asks this during the Onsite to assess your depth in software engineering. They want to see understanding of design patterns, system architecture, and the trade-offs involved in different technical approaches.
What the Interviewer Expects
- Design a complex system component applying multiple engineering principles
- Reason about system-level trade-offs: performance, reliability, developer experience
- Discuss advanced patterns: event sourcing, CQRS, distributed transactions
- Address cross-cutting concerns: observability, security, backward compatibility
- Demonstrate depth in both theoretical foundations and practical implementation
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
- What testing strategy would you use for this component?
- What are the security implications of this design?
- How would you measure the performance of this component in production?
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Core Design Principles
In designing a large-scale File Storage Platform for ServiceNow, several core design principles come into play:
- CAP Theorem: We must balance Consistency, Availability, and Partition Tolerance....
Architecture
The architecture of the File Storage Platform can be based on a microservices approach:
- Microservices: Each service will handle a specific aspect of file storage, like file upload, file retrie...
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