Design a distributed URL Shortening System
Last updated: February 3, 2026
Quick Overview
Design a distributed url shortening system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
DE Shaw
System Design
Software Engineer
DE Shaw
February 3, 2026Software Engineer
Technical Screen
System Design
Medium
297
6
3,374 solved
Design a distributed url shortening system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
DE Shaw asks this during the Technical Screen to assess your architectural thinking. They want to see how you decompose a complex problem, choose appropriate technologies, and reason about failure modes. Strong candidates proactively discuss monitoring, alerting, and operational concerns.
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
Requirements gathering and capacity estimation
API design and rate limiting
Message queues and async processing
High-level architecture and component design
Partitioning and sharding strategies
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
- How would you handle schema migrations with zero downtime?
- What happens if one of your database nodes goes down?
- How would you handle a 10x increase in traffic overnight?
- How would you handle a region-wide outage?
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Requirements
Functional Requirements
- URL Shortening: Accept long URLs and return a unique short URL.
- Redirection: Redirect requests from short URLs to the original long URLs.
- Analytics: Tr...
Capacity Estimation
Back-of-Envelope Calculations
- User Base: Assume 1 million users, each shortening an average of 5 URLs per month.
- Requests: Total requests = 1,000,000 users * 5 URLs = 5,000,000 short...
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