Marina Del rey-based Guidance, a developer of e-commerce websites for online retailers, said Tuesday that it has appointed Mike Hill as Executive Vice President. Hill replaces Anna Kennedy, who the firm said will be transitioning to a new role at the firm. Hill was most recently at ATG, where he was Regional Manager. He also has worked at Breakaway Solutions and TechnoInteractive, Inc. Guidance said Hill will oversee the firm's sales strategy, manage its business development team, and develop and maintain key relationships with its partners.