LinkedIn - LinkedIn is a business-oriented social networking service, mainly used for professional networking.
rysolv - Fix open source issues, get paid
TaskRabbit - TaskRabbit connects you to safe and reliable help in your neighborhood.
uTask - Hire a coder by having them do a real-world task
indeed - Find jobs using Indeed, the most comprehensive search engine for jobs.
Teamtailor - Teamtailor is the hub of recruitment that attracts candidates and manage their applications.