Hello ,
I can build such an app for you. I have been writing such applications for my clients. My offer will be unique from everyone else, i.e. budget isn't a big deal for me, all I need is a superb rating once I complete your app.
I am confident that you will love my work. My profile seems new but I hope that you will give me a chance to serve you as well as you will hopefully help me in getting started with my freelance career.
Thank you in advance for considering me for this job.