Design A/B Testing Infrastructure for mobile apps
Last updated: March 27, 2026
Quick Overview
Design a scalable a/b testing system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Jump Trading
March 27, 20263
4
1,669 solved
Design a scalable a/b testing system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Jump Trading 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
- Apply engineering principles to a realistic design scenario
- Discuss trade-offs between different approaches with concrete examples
- Demonstrate understanding of testability, maintainability, and extensibility
- Connect theoretical concepts to production engineering practices
- Discuss how the approach scales with team and codebase size
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 measure the performance of this component in production?
- 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 designing a scalable A/B testing infrastructure, we focus on several core design principles:
- Separation of Concerns: This principle helps us modularize the system into distinct components ...
Architecture
The architecture for the A/B testing infrastructure at Jump Trading would employ a microservices architecture. Key components include:
- API Gateway: Acts as the entry point for mobile app reque...
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