Architect a real-time URL Shortening Engine
Last updated: January 15, 2026
Quick Overview
Design a real-time url shortening system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Slack
January 15, 20261
4
3,682 solved
Design a real-time url shortening system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Software engineering fundamentals questions at Slack test your understanding of core CS concepts and their practical application. This Technical Screen question evaluates how you apply engineering principles to build maintainable, scalable software.
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
- How would you handle backward compatibility?
- What are the security implications of this design?
- How would you document this for other engineers?
- How would this design change if the team size doubled?
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Core Design Principles
For the URL shortening engine, core design principles such as Separation of Concerns, Scalability, and High Availability are paramount.
- Separation of Concerns: This principle allow...
Architecture
The architecture will follow a Microservices approach, consisting of the following components:
- API Gateway: Handles incoming requests and routes them to appropriate services. It provides ...
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