Design a A/B Testing for Confluent
Last updated: June 9, 2026
Quick Overview
Design a high-throughput a/b testing system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Confluent
June 9, 202614
7
2,621 solved
Design a high-throughput a/b testing system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Software engineering fundamentals questions at Confluent 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 document this for other engineers?
- 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 A/B testing system at Confluent, we should apply the Single Responsibility Principle (SRP) and Open/Closed Principle (OCP) from SOLID principles. SRP ensures that each component of the...
Architecture
The architectural approach for the A/B testing system should leverage a microservices architecture. Each microservice will handle specific functionalities: one for experiment creation, another for...
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