Dear Hiring Manager.
I saw your job description carefully.
I have much experience iOS app development.
I made many apps for my clients.
I have enough experience and portfolio that you can believe my skill.
I want you check the my portfolio first.
Now I finished whole my jobs. So If you provide this job, I can start immediately.
You can communicate with me at any time (nearly 24 hours) during developing your project. (via skype and email)
If you want, I can show you many demos.
I hope working with you in my mind.
Sincerely
From Han