freelancer
noun [ C ]
WORKPLACE uk/ˈfriːlɑːnsər/ us/ˈfriːlænsər/ (also UK freelance)someone who works on different projects with different companies instead of being a company employee:
He started off his career working as a freelancer at a design firm.
The online forum offers advice to freelancers, teleworkers, and companies looking for freelance staff.
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contractor