Design a real-time Feed Generation System
Last updated: May 23, 2026
Quick Overview
Design a real-time feed generation system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
HRT
May 23, 202653
7
2,189 solved
Design a real-time feed generation system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
This fundamentals question from HRT's System Design Round tests whether you can reason about software design at a deep level. The interviewer expects discussion of maintainability, testability, and operational considerations.
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
- What are the security implications of this design?
- How would this design change if the team size doubled?
- How would you measure the performance of this component in production?
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Core Design Principles
For the real-time Feed Generation System at HRT, the core design principles that apply include Scalability, Loose Coupling, and High Availability.
- Scalability is crucial because th...
Architecture
The architecture for the Feed Generation System will be built using a microservices approach, leveraging Kafka for event streaming and Kubernetes for orchestration.
- **Event-Driven Arc...
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