Stripe Distributed Systems Interview Questions 2026
Published July 22, 2026 · Updated July 22, 2026
6 real Distributed Systems interview questions asked at Stripe. Upvoted by engineers who cleared the loop. Covers System Design, Technical rounds.
6 questions
359 engineers asked
456 upvotes
Company: Stripe
Technology: Distributed Systems
All Distributed Systems Questions Asked at Stripe
Stripe
Hard
System Design round
KafkaPostgreSQLDistributed Systems
Design Stripe's webhook delivery system.
Stripe sends millions of webhooks per day to customer endpoints that can be slow, down, or buggy.
Cover: at-least-once delivery guarantees, retry with exponential backoff, ordering guarantees (or lack thereof), how to handle a customer endpoint that is down for 24h, and the dead-letter strategy.
↑ 79 upvotes · 77 engineers asked this · SDE2
Stripe
Hard
Technical round
PostgreSQLRESTDistributed Systems
Explain how Stripe handles exactly-once payment processing.
A customer clicks "Pay" twice in quick succession. How does Stripe prevent double-charging?
Walk through idempotency keys in the API, database-level constraints, and how the client should handle the case where the first request times out.
↑ 67 upvotes · 65 engineers asked this · SDE2
Stripe
Hard
System Design round
Distributed SystemsKafkaPostgreSQL
Design Stripe's fraud detection system. For every payment, you must decide accept/decline in under 100ms using hundreds of signals. Cover: feature engineering, real-time ML scoring, rule engine, and how you minimise false positives (declined legitimate payments).
↑ 68 upvotes · 44 engineers asked this · SDE2
Stripe
Hard
Technical round
RESTDistributed Systems
Explain PCI-DSS compliance requirements for handling card data. What is tokenisation? How does Stripe use it to ensure raw card numbers never touch customer servers? What are the implications for your API design?
↑ 52 upvotes · 32 engineers asked this · SDE2
Stripe
Hard
System Design round
PostgreSQLKafkaDistributed Systems
Design Stripe's subscription billing system (Stripe Billing). Customers are charged on recurring intervals (monthly/annual) in different currencies, with proration for plan upgrades. Cover: invoice generation, dunning for failed payments, and SCA (Strong Customer Authentication) compliance.
↑ 63 upvotes · 40 engineers asked this · SDE2
Stripe
Hard
System Design round
5–8 YearsSystem DesignDistributed SystemsRedis
Design a distributed rate limiter that works across 100 API servers. A user is allowed 1000 requests per minute.
↑ 127 upvotes · 101 engineers asked this · Senior SDE
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Frequently asked questions
Design Stripe's webhook delivery system.
Design Stripe's webhook delivery system.
Stripe sends millions of webhooks per day to customer endpoints that can be slow, down, or buggy.
Cover: at-least-once delivery guarantees, retry with exponential backoff, ordering guarantees (or lack thereof), how to handle a customer endpoint that is down for 24h, and the dead-letter strategy.
Explain how Stripe handles exactly-once payment processing.
Explain how Stripe handles exactly-once payment processing.
A customer clicks "Pay" twice in quick succession. How does Stripe prevent double-charging?
Walk through idempotency keys in the API, database-level constraints, and how the client should handle the case where the first request times out.
Design Stripe's fraud detection system. For every payment, you must decide accept/decline in under 100ms using hundreds of signals. Cover: feature engineering, real-time ML scoring, rule engine, and how you minimise false positives (declined legitimate payments).
Design Stripe's fraud detection system. For every payment, you must decide accept/decline in under 100ms using hundreds of signals. Cover: feature engineering, real-time ML scoring, rule engine, and how you minimise false positives (declined legitimate payments).
Explain PCI-DSS compliance requirements for handling card data. What is tokenisation? How does Stripe use it to ensure raw card numbers never touch customer servers? What are the implications for your API design?
Explain PCI-DSS compliance requirements for handling card data. What is tokenisation? How does Stripe use it to ensure raw card numbers never touch customer servers? What are the implications for your API design?
Design Stripe's subscription billing system (Stripe Billing). Customers are charged on recurring intervals (monthly/annual) in different currencies, with proration for plan upgrades. Cover: invoice generation, dunning for failed payments, and SCA (Strong Customer Authentication) compliance.
Design Stripe's subscription billing system (Stripe Billing). Customers are charged on recurring intervals (monthly/annual) in different currencies, with proration for plan upgrades. Cover: invoice generation, dunning for failed payments, and SCA (Strong Customer Authentication) compliance.
Design a distributed rate limiter that works across 100 API servers. A user is allowed 1000 requests per minute.
Design a distributed rate limiter that works across 100 API servers. A user is allowed 1000 requests per minute.