tnsittpsif

I am not particularly looking into building one myself, but I have been brainstorming about how one would approach this problem.

Where does one get all jobs data from? I am aware that there are APIs out there from where I can get data from, but that means I am basically building a front-end for data off some other platform(s).

Is getting data from recruiters the only way? How would one get the traction and popularity that they would need in order to attract more recruiters to come post on their jobs board?