Hi there!
We are a tech start-up from Singapore that develops our own in-house applications. We have been coding our own iOS and Android apps for the past year. As such, you can be assured that we are very familiar with the full process of developing your app for you.
(Our own app has product listings, Facebook/Google log-in, OTP phone authentication, camera functions, geolocation, messaging, reviews etc.)
For your project, we will use a similar methodology that we employ ourselves. InVision/Mockingbot for prototyping the UI and UX, coding using Objective C/SWIFT, and Java (if you need Android). Databases using SQL, AWS etc. So yes, this includes making your app available on cross platforms!
We'll be in close contact throughout the whole process via Skype/WhatsApp/Email, so communication won’t be a problem. After initial concept, we will come up with the storyboard, then the wireframe designs. After we determine what functionalities are needed, we then proceed to code it.
And one last thing, our primary motive here isn't to get away with a quick buck. We really want to build our portfolio and network of clients, because scaling our business is really what it's all about.
PS: pm me and we can set up a quick skype chat to discuss further
Really looking forward to working with you. Cheers!
Ck