How To Write A Letter Of Recommendation For Coworker . How long you’ve known the applicant. This excellent letter of recommendation for coworker shows the date the letter was created, the letter content, signature field for the sender, sender details, and the recipient information. 30 Letter Of For Coworker Examples TemplateArchive from templatearchive.com Character reference for a friend. Think of examples that illustrate your coworker’s abilities. When applying for a new job, a letter of recommendation increases the chance of new employment tremendously.