Architect a event-driven A/B Testing Engine
Last updated: July 7, 2025
Quick Overview
Design a event-driven a/b testing system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Supabase
July 7, 2025428
6
161 solved
Design a event-driven a/b testing system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Supabase 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?
- How would you document this for other engineers?
- How would you measure the performance of this component in production?
- What are the security implications of this design?
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Core Design Principles
For the A/B Testing Engine at Supabase, the core design principles that apply are:
- Single Responsibility Principle (SRP): Each component of the A/B testing system should have one reason to cha...
Architecture
The architecture of the A/B testing engine at Supabase will utilize a microservices approach with the following components:
- Event Producer: This service captures user interactions and generate...
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