First, either have it sanded or level it yourself with about one centimeter of leveling compound. Then you can lay the final covering or simply just paint it.
As a durable final covering, besides tiles in an affordable form, PVC in roll form is also suitable; more expensive are linoleum or (my favorite) rubber, where it is worth searching for leftover rolls.
Are door frames provided by the general contractor? Then it’s okay; otherwise, please inform the door manufacturer about the later floor covering so that the frames are installed at the correct height.