[elevanation]

Good questions!

Probably start as a standalone company / service, with the goal to get purchased by a large online career "solutions provider" (I can't stand these expressions).

Focus on the psychology of building trust from all parties. Then pick a small group of companies and applicants in a specific sub-field. Jet engine engineers. Snake veterinarians. Or something like that until you find the right sub-field which believes in the vision of trust.