Design an A/B Testing Platform

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Quick Overview

This question evaluates a candidate's ability to design scalable, reliable experimentation and analytics platforms, testing competencies in distributed systems architecture, deterministic user allocation and stickiness, event ingestion and logging, metric computation, and statistical validity for A/B testing.

Design an A/B Testing Platform

Company: Affirm

Role: Software Engineer

Category: System Design

Difficulty: hard

Interview Round: Onsite

Overview: This question evaluates a candidate's ability to design scalable, reliable experimentation and analytics platforms, testing competencies in distributed systems architecture, deterministic user allocation and stickiness, event ingestion and logging, metric computation, and statistical validity for A/B testing.

Read the full Affirm Software Engineer interview experience this question came from

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Affirm
Feb 27, 2026
hardSoftware EngineerOnsiteSystem Design
15
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