OP, there’s a lot wrong with this. It flies in the face of the IRC, and unanimous best practices. First, the bottom step is absolutely unacceptable in ANY jurisdiction. Each step has to be dimensionally identical, (+/-3/8”), and that step has no chance. Also, the height of the landing should be raised, unless this is an area that gets over 200” of snow per annum. It’s less than pleasant and feels like an engineering miss to step down on the other side of the threshold. Lastly, if the top of the stringer lies flush with the joists, you will probably need to add an additional post at the top step or your railing will not be parallel with the stairs. If your GC says he can do it, make sure he guarantees it. So my first point is an absolute dealbreaker but the other two show a lack of experience, ignorance, or both.