Employment Offer Letter Instructions. Both the offer letter and employment agreement serve the same basic purpose – to memorialize in writing the terms and conditions of employment.A sample letter offering a job contingent upon the results of a background check or other criteria. We write your offer on state approved forms, and we prepare these forms for you to sign, based on your instructions and our guidance. The following tips will help you prepare simple and effective offer letters that work best for your company's operating style and structure. The Utah code states that an employment contract does not have to be in writing unless the terms of the contract cannot be performed within one year.