Hi, Dear Sir
In reviewing your project description, I was excited to learn that you are looking for an amazing and reliable mobile app developer to make your idea come to life.
I am going to complete your project for a day.
Would you like to give me your app logic detaily?
I would be happy to provide further information at interview.
I hope I have demonstrated to you my interest and motivation to get involved in your project.
Thank you for the opportunity to submit my proposal for your project.
Lee