Independant

An individual whose assignment or field of employment is marked as "Independent" might also be seen as a mercenary.

• A mercenary is a person who is primarily concerned with making money, at the expense of ethics.

There are many ways a person can become an individual contractor, and many fields they can "specialize" in, as well.

An independent can be anything from a salesperson, to a smuggler, to a hit-man, to an exotic animal breeder.