StripeInterview Questions & Experience (2026)

How do you handle idempotency in payment APIs to prevent duplicate charges?

Implement a distributed lock manager for coordinating payment processing across services.

Design a multi-currency settlement system for international payments.

Implement a function to validate credit card numbers using the Luhn algorithm.

Explain how you would design a webhook delivery system with guaranteed at-least-once delivery.

How would you design a system to handle PCI compliance for storing card data?

Design a payment processing system that handles millions of transactions daily with 99.999% uptime.

How do you handle conflicting priorities from multiple stakeholders?

Describe a time you had to balance code quality with shipping speed.

Design a fraud detection system for real-time payment transactions.

How would you expand Stripe into a new country? What challenges would you anticipate?