While a veritable cottage industry has sprung up around sourcing for tech talent, particularly in the profile aggregation space (think: Entelo, Dice Open Web, Gild), comparatively few options exist for actually screening tech skills, especially developers.
Most of these dedicated tech recruiting tools offer integrations with public code repositories like GitHub or StackOverflow. None of these emerging solutions, however, offer employers the kind of comprehensive skills assessment capabilities that have become ubiquitous in the recruiting process for almost every other functional area.