Who is the Poster, the Hirer, and the Employee?
A Poster is a person who has signed up on Spare Staff website and lists an employee on Spare Staff.
An Employee is a person listed by a Poster on Spare Staff for hire. The Poster can list him/herself as the Employee (e.g. job seekers).
A Hirer is a person who has signed up on Spare Staff website and hired a listed Employee on Spare Staff. The Hirer must represent a company (e.g. HR managers, business owners).