Architect a multi-tenant URL Shortening Engine
Last updated: December 2, 2025
Quick Overview
Design a multi-tenant url shortening system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Visa
December 2, 2025143
6
3,829 solved
Design a multi-tenant url shortening system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
This is a common system design question asked during Technical Screen at Visa. The interviewer expects you to demonstrate your ability to design large-scale distributed systems, make well-reasoned trade-offs, and communicate your thought process clearly. Visa values engineers who can think about scalability from day one.
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
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
- What monitoring and alerting would you set up on day one?
- How would you handle a 10x increase in traffic overnight?
- What would the deployment pipeline look like for this system?
- How do you ensure data consistency across multiple services?
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Requirements
- Functional Requirements:
- Allow users to register and create unique short URLs.
- Redirect users from short URLs to the original URLs.
- Provide analytics on URL usage (clicks, g...
Capacity Estimation
- Estimating Scale:
- Assume Visa processes 1 billion transactions a year.
- If we estimate that 1% of these will use our URL shortening service, we expect 10 million requests per year or ...
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