Hello Sir/Madam,
I believe that I have the drive, energy, and knowledge to be perfect for the development of this application. My experience as a Developer includes working with mobile applications by integrating them with different platforms using an assortment of protocols that makes me perfect for this job.
I have in the past work done many other app development projects which required extensive detailing. And, you can have a look at my portfolio to know more. I hope you would choose me for this job, looking at my expertise, and my assurance to get the job within budget and on time.
With regards