Can someone give me feedback on my ER diagram?
1) There are 2 independent relations: from Employee to Job and from Employee to Job History. This means, that potentially Employee can have Jobs that are not contained in the Job History, and vice versa, there can be Job History elements for which there is no element in the Job relation.

2) Wording is misleading. Based on relation from Job to Job History one can suppose that StartDate and EndDate mean period where this Job existed. To different times different Employees could have been assigned to this Job. But based on the relation from Employee to Job History one can suppose that StartDate and EndDate means dates of assignment of particular employee to this Job. Which of these you mean is not clear.

3) I would expect that Job is related to Department, not the Job History.