Humana will hire dozens of healthcare professionals to staff its new Humana Cares national operations and service center in St. Petersburg, FL. Humana initially is employing 275 people at the new center, located in the Carillon business park, and plans to expand its on-site staff to more than 325 by the end of this year. Since fall 2008, the program has added about 100 workers and currently is hiring registered nurses, social workers, community health educators and other support staff.