Hi..
Your job posting really caught my eye.
I read carefully job description and I believe I'm very qualified for your project.
As a senior developer I’ve built dozens apps over 4 years. You can look through my profile and portfolio.
I have rich experience and skills to meet your all requirements. In addition I can build the lifecycle of the app with high-level architecture.
If you hire me,
1. I'll work on your business time, so you can ping me anytime.
2. I'll report the developing process everyday, so you can grasp the situation.
Thank you so much for your consideration - I hope to hear from you soon!
Best regards.