Toptal

Toptal is a global network of elite software engineers. Toptal works with clients to understand their project/team needs and custom-matches them with pre-screened developers who join their teams on a full-time, part-time, or hourly basis. 

Toptal has worked with over 2,000 clients to date and is on track for $80M in revenue in 2015. Toptal clients include Airbnb, J.P. Morgan, Zendesk, Artsy, IDEO, Pfizer, and many more. 

The Toptal network includes thousands of developers in over 93 countries. To be accepted into the network, all Toptal developers must pass a screening process  that includes tests for English and communication skills, timed algorithm tests, live coding exercises, and test projects.