Writing a cover letter for a previous employer requires highlighting your existing knowledge, valuable skills, and showcasing how you've grown since leaving. We'll tell you why you might be asked to reapply for your current job and how you can succeed.Plus we've provided some sample cover letters to use. To make your cover letter stand out, add specific examples that show how you've solved problems or gotten results in past roles. Don't forget to include a cover letter in the body of the email. • When emailing resume files, name them so the employer can easily identify it as your resume. The document provides guidance on writing an effective cover letter to apply for a previous job or position at a former company. Not sure how to write a cover letter? Here are eight steps to writing one that screams, "I'm a great hire! " Step 1: Write a fresh cover letter for each job (but yes, you can use a template).