How would you answer an interview scenario involving transaction boundaries?

For an interview scenario involving transaction boundaries, I would first clarify the business goal, scale, constraints, and the failure or quality attribute the interviewer wants to explore. Transaction boundaries define which state changes must succeed or fail together for a use case. In this scenario, an order write and an integration event must not get out of sync. Explain the transaction approach. For production, coordinate transactions near the use-case boundary, keep them short, and use outbox or saga patterns when work spans services. I would then explain the main alternatives and tradeoffs, identify likely failure modes, and describe how I would validate the solution through testing, observability, security controls, and recovery or rollback planning.