IELTS letter

Good day. I am continue my IELTS preparations. Can you please show me my grammatical mistakes? Thank you in advance.

Question:
You have decided to apply for a job as a Spanish instructor that was advertised in the April edition of the magazine Teacher Professional. This ad was posted by Mr John Sullivan, director of the Spanish department at The Language Institute of Great Britain in London, England. In your letter to Mr Sullivan:
* explain why you are writing
* describe your qualifications and experience
* explain how they can contact you
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Dear Mr John,

My name is Georgiy, and I am writing to apply for the position of Spanish instructor which I have read recently in the Teacher Professional magazine.

My origin is Russian and I have arrived to Great Britain several weeks ago. I am going to live and work in this country for at least several years and at the moment I am looking for an interesting job, which will require all my knowledge and skills.

Although I am not a native Spanish speaker, I can proudly said that my language skills in Spanish is far beyond normal, since I had been living in Madrid for 5 years. I worked as an interpreter, and was able to study Spanish very professionally. Spanish is not the only language I am familiar with. I also know such languages as French and German. And,  my home country is Russia, and my native language is russian. 

All my skills and achievements are presented in my curriculum vitae in details, which I have added to this letter.

I am looking forward to hearing from you.

Yours sincerely,
Georgiy Ivanov.