SMA Inc. enlists engineers, project managers, designers and other professionals to provide on-demand work at professional rates of pay

Expected pay: varies

Husl$core: $$$$$

Robert Half connects workers with contract, temporary and permanent jobs in finance and accounting; tech; marketing & sales; health care; law; and administration. 

Expected pay: varies by position

Husl$core: $$$$$

Catalant, formerly HourlyNerd, connects skilled freelancers with companies needing help with anything from logistics to marketing.

Expected pay: $100+ per hour

Husl$core: $$$$

Maven links clients needing professional advice with independent experts who have relevant expertise.

Expected pay: You set it

Husl$core: $$$$

Zintro is a recruiting company that plays matchmaker between consultants and companies needing relevant expertise.

Expected pay: $100+ per hour

Husl$core: $$$$

Gerson Lehrman Group (GLG) is an international consulting firm that enlists freelancers to provide paid advice on a wide array of topics, from finance to marketing

Expected pay: you set it

Husl$core: $$$$