How would you answer an interview scenario involving Mediator pattern?

For an interview scenario involving Mediator pattern, I would first clarify the business goal, scale, constraints, and the failure or quality attribute the interviewer wants to explore. Mediator coordinates communication between components so they do not reference each other directly. For production, keep request ownership clear, use focused handlers, avoid business logic in pipeline plumbing, and instrument request flow. 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.