AI & Technical question

Design a Shopify checkout system.

Practice this question out loud. An AI interviewer asks it, follows up like a real interviewer would, and scores your answer. Type or speak.

What this question tests

Technical and product design skill applied to a payments-critical checkout flow with reliability and conversion stakes.

Clarify scope, the merchant-facing checkout configuration or the buyer-facing payment flow, since Shopify serves both sides.
Identify buyer needs, minimal steps, multiple payment methods, and trust signals like security badges.
Identify merchant needs, customization within brand guidelines, abandoned cart recovery, and reliable, fast processing.
Design the flow, cart review, shipping info, payment method selection with saved payment support, and a single confirmation step.
Address technical requirements, PCI compliance for payment data, idempotent order creation to prevent double charges, and graceful failure handling for declined payments.
Define success metrics, checkout conversion rate and payment failure or retry rate.

Separates buyer experience design from merchant configuration needs, since Shopify checkout serves two very different audiences.
Names concrete technical requirements, PCI compliance and idempotent order creation, showing real technical depth, not just UI flow.
Addresses failure handling explicitly, e.g. a clear retry path for declined cards, since payment failures are a major conversion killer.
Sets a measurable target, e.g. reducing checkout abandonment by a stated percent, marked as an assumption.

Designing only the visual flow and ignoring payment reliability and compliance requirements.
Not addressing what happens when a payment fails or times out.
Treating merchant customization needs as an afterthought.

How would you prevent duplicate charges if a payment request is retried.
How would you handle a declined payment gracefully.
How would you balance merchant customization with a consistent checkout experience.