Greetings sir,
I've done research on your app and first of all, I'm amazed with the design of your app. Simple, easy to use and attractive. From the looks of your android app and the state machine you provided, I have a clear picture of what needs to be done. The only unknown variable is communication with your server, but that shouldn't be the problem.
The app would undergo several stages (UI, server communication, functionalities) and you will have insights in each of them, so in case of errors or similar, I can act immediately and fix in the early stages.
I have worked on similar app before, with similar design. The previous customer I worked with wanted look and feel to be exact as existing Android app, so if you perhaps want similar with your app, it can be done, with little extra time.
Free Demos are our good practice, and we can offer one as to display quality of our work, and should you find it satisfying we can proceed with our work.
As for our expertise, we are team of 17 European PHP experts / Windows /Web / iOS / Android developers, all experienced in their field of work. Quality is our main goal, for the purpose of being team of choice for our employers should they need any IT work done again.
If you have any questions please do not hesitate to contact us.