There are four types of users in this application:
Admin: who handles the application and creates an account for different types of users like candidate, company and vendor. And handle the candidate's job application, also change his status.
Candidates: Who will apply to the JD that company or admin posts and can see the application status. He can apply to any number of companies but the company would see his applicaton only when the admin approves it.
Company: Who can view the candidate and accept the candidate application or reject it. Also he can schedule an interview with the candidate. They can also upload Job description.
Vendor: Who can create candidates by applying to jobs posted by the Company or admin.