The following information provides a walkthrough for a candidate applying for a job within the. Commonwealth of Massachusetts.State clearly in your opening sentence the purpose for your letter and a brief professional introduction. The following guide provides a walkthrough for a candidate applying for a job within the Commonwealth of Massachusetts. Knowing how to write a cover letter for a job can help take your job application to the top of the pile. Here's exactly how to write one. Your cover letter should reflect the requirements and skills the company is seeking in the job description. Learn how to write a cover letter for a job with tips from career experts. Browse professional examples to impress hiring managers. The first paragraph of your letter should include information on why you are writing.