Build a distributed URL Shortening Pipeline
Last updated: March 5, 2026
Quick Overview
Design a distributed url shortening system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Slack
March 5, 202610
14
2,654 solved
Design a distributed url shortening system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
This fundamentals question from Slack's Onsite 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
- Apply engineering principles to a realistic design scenario
- Discuss trade-offs between different approaches with concrete examples
- Demonstrate understanding of testability, maintainability, and extensibility
- Connect theoretical concepts to production engineering practices
- Discuss how the approach scales with team and codebase size
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 you handle backward compatibility?
- How would you measure the performance of this component in production?
- What are the security implications of this design?
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Core Design Principles
For a distributed URL shortening system, several core design principles apply:
- Separation of Concerns: Each component of the system should have distinct responsibilities. For example, the URL ...
Architecture
The architecture for this URL shortening service would utilize a microservices approach:
- API Gateway: All requests would first hit an API Gateway, which handles routing to appropriate services....
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