What does the pre-sales and after-sales service specialist of a real estate company do?

It depends on whether you are on the spot or an intermediary. If you are an intermediary before and after the sale, that is: show customers the house and buy a house, and the follow-up work is equivalent to sales. If the site, the customer's signing process and all the customer's later work should follow the new pure sales nature, it is generally inseparable from the sales nature.