Amazon.com is poised to make a huge expansion in Hebron that could almost double its work force. The company is planning to hire hundreds of full-time employees and thousands of seasonal workers at its fulfillment center near Cincinnati/Northern Kentucky International Airport over the next few months. Boone County Judge-Executive Gary Moore said Amazon has indicated it plans to hire as many as 900 full-time, permanent employees and up to 5,000 seasonal workers to meet holiday needs.