Design a large-scale Feed Generation Platform
Last updated: April 13, 2026
Quick Overview
Design a scalable feed generation system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Citadel
April 13, 202617
4
3,751 solved
Design a scalable feed generation system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Software engineering fundamentals questions at Citadel 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
- 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 document this for other engineers?
- How would you measure the performance of this component in production?
- How would this design change if the team size doubled?
- What testing strategy would you use for this component?
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Core Design Principles
For the Feed Generation Platform at Citadel, the following core design principles apply:
- Separation of Concerns: This principle helps in isolating different functionalities of the system, maki...
Architecture
The architecture of the Feed Generation Platform can be based on a microservices approach:
- API Gateway: Acts as the entry point for client requests and handles routing to appropriate microserv...
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