Hello!
I have read your job description.
And I am eager to do your job at once, because now I've totally understood and have good knowledge about your job.
As you can see in my portfolio, I have good knowledge and experience in GPS tracking system and Google Maps API programming.
I have also ever developed location-based system for Android and IOS.
So there is no reason why I can't integrate a GPS tracking system into mobile app.
You maybe find out I could be an able developer for your job.
If you hire me and work with me, I will devote myself to do your job.
And furthermore, you will get a superior work to the others, and so all of the customers will be in love with your work and enjoy it.
I hope to be with you, with your work.
Best regards...
Thanks.