Dear Sir!
I've just read your job post and much interested in your project.
I have been creating high quality and excellent iOS and Android apps for 6+ years using Swift, Objectiv-C, Java.
I've developed several apps such as Dating, Shopping, Health/Fitness, Photo & Video sharing, Taxi Booking, Food delivery and etc.
I've rich experiences to work with various 3rd-party services and APIs to integrate them into existing and new applications to extend required functionality.
Best Regards.