How would you answer an interview scenario involving blue-green deployment?

In an interview, I would first define blue-green deployment and the problem it solves, then explain how I would keep environments equivalent, automate traffic switching, validate readiness before cutover, handle shared database compatibility, and define how stateful sessions or background work move between versions. I would also call out the main failure mode: deploying destructive database changes before traffic switches can make the old environment unusable, removing the main rollback advantage. Finally, I would describe how I would test, monitor, and safely roll back or recover the solution.