Your resume is the first thing a recruiter or hiring manager sees, and is a direct reflection of not just your experience, but your attention to detail and written communication. If you even want the chance to get through the door, you want to make sure it is perfect! You should also always look at your resume like a contract, anything that is wrong in terms of schooling, employment dates, etc. can be a reason why you do not receive an offer. Ensure that everything is clear so nothing can be misconstrued.
