1. A letter of interest gives you an opportunity to talk to your prospective employers about the type of job you need and how your current skills match perfectly with the job. Your main job is to look for ways to sell yourself to the hiring manager so he can think of you as the perfect fit for the job.
2. Before going into what should be included in your letter of interest, try to contact someone from the department you are willing to work with. This will help your letter to be seen early.
3. It is usually advised to get a contact of someone at the company which you are related to in some ways; the person might even be an alumnus of your school. Ask them about some basic information about the company and every other thing you should know.
4. Start your letter by restating why you have decided to write a letter of interest to the company. Reveal where you would like to work in the company and the position you are targeting, plus how your skills fit perfectly for the job.
5. Start with a professional greeting.
6. Use the first paragraph to inform them about how you are planning to contribute positively to the company.
7. Also, reveal in the middle paragraph your previous accomplishments at your former jobs.
8. Use the last paragraph to show your interest in an interview with the employer.