Dear.
I am a senior developer for web and mobile development . At web and mobile, I have the experiences about 10 years . When I work with clients, I inform them how and what can I do on your idea and I make schedule for developing on project and confirm with client and according to it, I get contract with clients. And On developing, I make that clients know how developing and until where developed and what framework or library used. So, Clients can confirm my developing method and used framwork/SDK. Your job need a talanted developer with web, mobile & design skills. I can work your job well because I have android and ios developers and designers and 3D designers and many my last developed source codes and many experiences. I'd like to work to long term on projects with client. When you develop mobile projects, sometimes you need to use restAPIs or to make user management system on web for collecting many users. So, I think that you sometimes need web developers too. web developer surely must know able to manage your Clouding/Hosting Server with web develop together. if you also want to make the user management system, I can work on CMS(web) including user management system. I can make new project according to your requirement because My logic and sense on projects is very strong. I have many experiences on paypal SDK, mastercard SDK, visacardSDk, wechat purchase SDK, android in-app purchase, ios in-app purchase(billing) SDK. So, it also is no problem. For best apps