Upwork, Inc. is an online marketplace that enables businesses to find, hire, and pay freelancers for short-term and longer-term projects. Its marketplace offerings include Upwork Basic, Upwork Plus, Upwork Business, Upwork Enterprise, and Upwork Payroll. The company was founded by Odysseas Tsatalos and Efstratios Karamanlakis in December 2013 and is headquartered in Palo Alto, CA.