Dear Ms. Taylor,
I recently heard about the opening for a qualified Technical Writer, which is very appealing to me. I am very experienced, a talented writer, and have included my resume.
As you will see from my resume, I have all the qualifications you are looking for. I have worked as a Technical Writer for the past seven years, and have countless awards for my work in tech manuals and user guides. Prior to this, I was an IT professional for Sunoco, Inc for three years. I also have a degree in Computer Science. The unique thing about my abilities and experience is that I have both the knowledge of writing and technical prowess to offer my work, and thus, my technical writing makes the complicated understandable.
If you feel that I am the suitable person for this position, I ask that you call me at (555)-555-5555 at your earliest convenience. Thank you for considering my resume and this letter for this opportunity, and I look forward to your response.