A more thorough explanation:

Definition: A hireling is a person who is hired to work for wages, especially someone who works only for the sake of payment.

• A construction worker who is paid by the hour is a hireling.
• A maid who is hired to clean a house for a set fee is a hireling.
• A freelance writer who is paid per article is a hireling.

These examples illustrate the definition of a hireling because each person is working solely for the purpose of receiving payment. They are not invested in the work beyond the financial compensation they receive.