Design a Content Delivery Service
Last updated: September 13, 2025
Quick Overview
Design a low-latency content delivery system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Zscaler
September 13, 20257
14
1,995 solved
Design a low-latency content delivery system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Software engineering fundamentals questions at Zscaler 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
- 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?
- How would you document this for other engineers?
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Core Design Principles
For designing a low-latency content delivery service, we should apply the SOLID principles:
- Single Responsibility Principle: Each service component should focus on one aspect of the conten...
Architecture
The architecture for the content delivery system will leverage a microservices approach to enhance scalability and maintainability.
- Edge Servers: Deployed globally to cache content closer...
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