In the past, marketing teams have been largely skill-driven. Need help with organic search visibility? Hire an SEO expert. Need more traffic? Bring on a PPC specialist.

The problem, of course, is that these narrowly-defined job roles limit the kind of cross-functional collaboration that drives real growth. And when considered in light of how difficult hiring has become in the United States, it's time for a new approach to marketing team building that fuels holistic growth through hiring for seven key roles.