A cover letter is a onepage document that supplements your resume. Catch their eye and get your foot in the door with a professional résumé cover letter.Buckeye Résumés is a custom cover letter service based in Columbus, Ohio. Save your cover letter to a PDF to avoid formatting issues. The goal of a cover letter is to sell the employer on how your skills and experiences make you the best candidate for the job. Why write a cover letter? The cover letter that accompanies a résumé can be as effective as the résumé itself — and perhaps even more so! Describe your unique skills, attributes, and what you can offer the employer. Here's the cover letter formula that got me my current job: Analyzing the job description. Identifying what to include in your cover letter.