Triplebyte - Hire engineers by measuring their ability, not credentials
FaceCode - Hire top tech talent with video interviews
Interview Insider - Coding interview process at different tech companies
Daily Coding Problem - Get exceptionally good at coding interviews
HackerEarth - HackerEarth is the network of top developers across the world. They connect to start-ups, tech companies, organizations and discover the best developer jobs. They participate in programming challenges and compete against other top developers.
Interviews on Skype - Test candidates using a real-time code editor over Skype