What it does: Handles recruitment and HR functions for companies with 25 to 250 employees and places contract professionals at companies of all sizes. Major clients include Siemens Telecommunications and the Staubach Co. Why it's growing A tight labor market for skilled professionals. Also, more companies are auditioning employees as temps before offering full-time positions. HumCap targets VC-backed emerging companies that can't, or don't want to, hire full-time HR employees and offers to serve as their part-time recruiters and HR execs. Founder and CEO Tad McIntosh, a West Point grad and former Army Honor Guard member, was head usher at Bill Clinton's first inaugural.