Certified Dietary Manager | Dietary Supervisor – Full-Time. Stone Cottage Care Center | Sigourney, IA. Rate: $21/hour. Stone Cottage Care Center is seeking a. Certified Dietary Manager / Dietary Supervisor. to lead our dietary services department in our skilled nursing facility in Sigourney, IA. This is a. full-time, working manager. role, meaning the individual will both supervise the department and actively work alongside the team as a cook or ...