Stripe · Backend Software Engineer (New Grad)
Stripe's backend loop is known for being practical rather than puzzle-heavy: instead of abstract LeetCode, you get a hands-on coding round in a real editor (often building or extending a small service), an API/integration round, and a debugging round on an unfamiliar codebase. Because Stripe moves money, correctness, idempotency, and reliability are treated as first-class skills. Expect to reason about failure modes and edge cases far more than about clever asymptotics.
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What this interview tests
- Practical coding in a real editor (build/extend a small service)
- API and resource design (idempotency, status codes, pagination)
- Correctness and edge-case handling for payment flows
- Debugging unfamiliar code from a failing test
- Reliability thinking: retries, timeouts, partial failure
- Reading and integrating against real API contracts
Common question themes
Implement paginated fetching over an API
Design a charge/refund endpoint with idempotency keys
Debug why a failing test breaks in an unfamiliar service
"What happens if this request is retried or double-submitted?"
Parse, validate, and process a batch of records
Model a money-movement resource and its states
Modeled on a public Stripe backend new-grad posting