Questions for professional programmers who are often contracted out for various positions rather than being part of a company.
A freelancer, freelance worker, or freelance is somebody who is self-employed and is not committed to a particular employer long term. These workers are often represented by a company or an agency that resells their labor and that of others to its clients with or without project management and labor contributed by its regular employees. Others are completely independent. 'Independent contractor" would be the term used in a higher register of English.