I am writing to apply for a Juvenile Probation officer position in your office. My internship with your office in the summer of 2004 prompts my interest.Writing a cover letter for a previous employer requires highlighting your existing knowledge, valuable skills, and showcasing how you've grown since leaving. This letter is especially helpful if you're applying to a traditionally unrelated industry from your previous job. It does the following:. Following your header, which highlights your contact information, include the date of your application submission and the employer's contact information. A cover letter must accompany each resume you send to an employer. This letter will be the potential employer's first exposure to you and your work. Start off with a salutation at the beginning. Cover letter template​​ The opening paragraph should explain why you are writing, giving your specific employment interest.