← All companies
Crypto / fintech
Coinbase interview themes
What people report studying for — not a take-home dump. Last editorial update 2026-08-14.
Ledger grainReconciliationIdempotency
Rounds you should expect
Ledger
Deposits, withdrawals, and fees as facts — not a running balance column you overwrite.
Ops
A webhook retried. How you do not mint two ledger rows.
Recently added questions
2026-08-28 · Ledger grain
A deposit webhook retried. How do you not mint two ledger rows?
Idempotency key (or natural key on payment_id + event_type) and an upsert. A running-balance column you overwrite is not a ledger.