Wildcard - Discover, connect and meet people at communities
hackattic - No nonsense, real world programming challenges
Shapr - A completely free way to build your professional network.
HackerRank - HackerRank is a platform that allows companies to conduct interviews remotely to hire developers and for technical assessment purposes.
LetsLunch - Do more with your lunch hour. Meet new people.
Takehome - Effective and humane coding challenges for candidates