Codeable is the #1 outsourcing service for WordPress development.
Upwork is the leading online workplace, home to thousands of top-rated freelancers ready to work on your WordPress project today.
Freelancer.com has the best WordPress developers and consultants ready to assist with your project!
Toptal is a marketplace for top WordPress developers, engineers, programmers, coders, architects, and consultants. Top companies and start-ups choose Toptal WordPress freelancers for their mission critical software projects.
For relatively small-scale, and pre-defined WordPress development, Envato provides a micro-job board type service called Envato Studio.