Dear Sir
How are you?
I have just read your job description very carefully and I think I am very qualified for your job.
I am professional iOS game developer and I have rich experiences in iOS game programming for 7 years long.
I can develop the game project perfect and no problem.
I will wait for your reply.
Thank you.
Kindly regards,
So
I am a United States based developer who would love to make this mac application for you. If you have any questions or want to discuss the project more, feel free to send me a message and let's get this project started!