Design a large-scale Ad Serving Platform
Last updated: July 22, 2025
Quick Overview
Design a distributed ad serving system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Airbnb
July 22, 202588
6
4,109 solved
Design a distributed ad serving system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Software engineering fundamentals questions at Airbnb test your understanding of core CS concepts and their practical application. This System Design Round question evaluates how you apply engineering principles to build maintainable, scalable software.
What the Interviewer Expects
- Explain the concept clearly with a practical example
- Discuss when and why to apply this principle
- Identify common mistakes and anti-patterns
- Compare with alternative approaches
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 measure the performance of this component in production?
- How would you document this for other engineers?
- What are the security implications of this design?
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Core Design Principles
For the design of a large-scale Ad Serving Platform, the following core design principles apply:
- Separation of Concerns: This principle ensures that different parts of the system handle distin...
Architecture
The architecture of the Ad Serving Platform at Airbnb can be designed using a microservices approach:
- Frontend Service: This handles incoming ad requests and routes them to the appropriate mic...
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