Hello, Sir.
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 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.
Thanks & Regards.