Dear sir,
Thank you for this opportunity.
Don't worry and doubt about my strong skills.
I am extremely experienced in Mobile App development for iOS and Android.
I will make sure your app will be very professional, user-friendly as I have developed a lot of successful Mobile Apps for iOS and Android, using Objective-C, Swift, Java, etc over the past 7+ years.
And I speak fluent level of English and have good communication skills, available on Skype always.
With my experiences in Mobile App development, High skills, Full commitment to work and Perfect English, there's no doubt for me to complete your job.
I always respect your idea for your job, and I will do my best for your job.
Your Success Is My Success!
I am looking forward to hearing from you.
Best Regards.