Dear Sir
Fast + Good + Cheap is my forever business slogan!
I've just read your job posting line by line, and fully understood what you want now.
I have full experience in iOS/Android/Backend Webserver for 7+ years.
I am very interested in this job post.
I will do my best for success of your business and provide you high quality result with satisfaction.
Hope to get the detailed spec from you.
And I can adjust my working time as your timezone, work 10+ hours per day.
Looking forward to hear from you soon positively and build a long term business relationship in this chance.
Thanks for your time and Best Regards.