Design a payment system
Company: OpenAI
Role: Software Engineer
Category: System Design
Difficulty: medium
Interview Round: Onsite
Overview: This question evaluates a candidate's competency in designing secure, reliable payment architectures, covering API design, transaction lifecycle management (authorization, capture, refund), idempotency, internal ledgers, webhook integrations, and reconciliation with external processors.
Read the full OpenAI Software Engineer interview experience this question came from