Problem
How would you design a high-throughput payment ledger system at Square that guarantees exactly-once processing for transactions?
Practicing as: Software Engineer interview at SquareHi, I'll play your Square interviewer for the Software Engineer role. Candidates describe these interviews as often stressful and moderately difficult, so expect me to be direct and to the point. Take your time with the question above and answer like we're in the room.
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