Build a scalable Feed Generation Pipeline
Last updated: February 2, 2026
Quick Overview
Design a scalable feed generation system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Capital One
February 2, 202611
11
4,637 solved
Design a scalable feed generation system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Capital One asks this during the System Design Round to assess your depth in software engineering. They want to see understanding of design patterns, system architecture, and the trade-offs involved in different technical approaches.
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 this design change if the team size doubled?
- What are the security implications of this design?
- What testing strategy would you use for this component?
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Core Design Principles
For building a scalable feed generation pipeline at Capital One, we will apply the following core design principles:
- Single Responsibility Principle (SRP): Each component in our system should ...
Architecture
The architecture for our scalable feed generation system at Capital One will consist of the following components:
- API Gateway: Acts as the entry point for clients to submit feed requests. It h...
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