SAA has developed some appointment letter templates that can be used to inform employees of their new position, salary increase, or new appointment status. Learn what to include in a job offer letter and use our ready made template.Simply fill in the blanks, and you're ready to offer work. An Employment Offer Letter provides the employer with an opportunity to formally make an employment offer to an employee in a clear and concise fashion. As a state employee, you may be eligible to receive benefits through the state of Washington. Completing these tasks at the beginning of an employee's career avoids unnecessary complications in the future. Offers of employment must be extended and accepted in writing. Casual job offer letter template.