Stripe System Design Interview Questions 2026
Published July 22, 2026 · Updated July 22, 2026
5 real System Design interview questions asked at Stripe. Upvoted by engineers who cleared the loop. Covers System Design, Technical rounds.
5 questions
158 engineers asked
255 upvotes
Company: Stripe
Technology: System Design
All System Design Questions Asked at Stripe
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
Stripe
Hard
Technical round
3-7 yearsSecuritySystem DesignSQL
Explain idempotency keys in a payments API. What specific failure mode do they prevent, and how would you design the storage layer for them so they don't become a bottleneck?
↑ 40 upvotes · 20 engineers asked this · Senior SDE
Stripe
Medium
Technical round
3-6 yearsNode.jsSystem DesignKafka
Design a webhook delivery system that must guarantee at-least-once delivery to customer endpoints, with retries and backoff, without letting one slow customer endpoint block delivery to others.
↑ 31 upvotes · 14 engineers asked this · Senior SDE
Stripe
Medium
Technical round
2-5 yearsPostmanSystem Design
How would you test a payments API endpoint for race conditions where two simultaneous requests might both succeed at deducting from the same account balance?
↑ 24 upvotes · 11 engineers asked this · QA Engineer
Stripe
Hard
System Design round
4-8 yearsSystem DesignSQL
Design a double-entry ledger system for tracking money movement between accounts. Why is this pattern preferred over simply updating a balance column, especially for auditability?
↑ 33 upvotes · 12 engineers asked this · Senior SDE
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Frequently asked questions
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.
Explain idempotency keys in a payments API. What specific failure mode do they prevent, and how would you design the storage layer for them so they don't become a bottleneck?
Explain idempotency keys in a payments API. What specific failure mode do they prevent, and how would you design the storage layer for them so they don't become a bottleneck?
Design a webhook delivery system that must guarantee at-least-once delivery to customer endpoints, with retries and backoff, without letting one slow customer endpoint block delivery to others.
Design a webhook delivery system that must guarantee at-least-once delivery to customer endpoints, with retries and backoff, without letting one slow customer endpoint block delivery to others.
How would you test a payments API endpoint for race conditions where two simultaneous requests might both succeed at deducting from the same account balance?
How would you test a payments API endpoint for race conditions where two simultaneous requests might both succeed at deducting from the same account balance?
Design a double-entry ledger system for tracking money movement between accounts. Why is this pattern preferred over simply updating a balance column, especially for auditability?
Design a double-entry ledger system for tracking money movement between accounts. Why is this pattern preferred over simply updating a balance column, especially for auditability?