I got at least one job through LinkedIn but it wasn't a quality job. Pay was good but was subcontracted and we were treated differently. In my industry you really need to know someone. Linkedin does help in a pinch for sure though.
Maybe a Freindica Business option. Wonder if it's open source. Maybe, it needs to be free with student IDs or some type of apprenticeship, and paid for by professionals, or just some other bot prevention measure.
Maybe have it with an interface that auto uploads formats that can be used by employers for resumes. Then you can sell the interface option to employers as a way to get resumes autofilled. Might be complicated.