Can a new developer take over a project someone else started? — answered by Engineer Saeed Baatiah
Yes, and it is very common. The only requirement is access: the code, the database, and the hosting and domain accounts. Before agreeing a price, ask for a short paid assessment — usually two days — where the developer inspects what exists and tells you honestly whether it should be built on or rebuilt. Assessing before pricing spares you the surprise of half the budget going into understanding old code.