Hello,
I have read your job's description and i understand how important this cover letter is to you, so i am available to write it for you. From what i understand, the letter will need to be official, although i do not know to whom exactly do you want the letter to be addressed and sent to, and i will need some clarifications about this ascpect.
Furthermore, i have experience in writing Resumes, CVs, so i am sure that i can create an almost perfect resume that can be useful for you. The letter and the resume could be written in 24 hours-maximum 48 hours.
I am looking forward to hearing from you and working for you. Thank you very much for your attention. Have a nice day.