Hi There,
I have read your post and come to know that you would like to make required modification in your already developed application "Shoe shuffle", and make that app latest mobile OS compatible and re-submit application on the respected store.
As of your post suggest, you need one expert who can fix bugs in your existing system. We would like to discuss more with reference to your existing developed code and changes & enhancement which you need, so based on that, I will have a better idea for the suggestion for your enhancement plan.
We Believe In order to achieve your goal or Scope, We have a bunch of skillset like Native(Android & iOS), Cross-Platform (React Native, Flutter, ionic), PHP(Including all Major Frameworks), Dotnet, Node JS, Angular JS, React JS, DB(MySQL, Realm, FirebaseDB, MongoDB, Oracle), Different third-party SDKs and APIs.
We are a team of highly experienced(>2 Years) People which covering the area of Project Management, Designing, Development, Backend & APIs, and QA.
As Quality is the prior matter for all, we have standardized our Work Pattern and Flow to maintain this which can strongly touch your expectations.
I hope you at least see the capability in us through this proposal, rest will be handled by our team with committing to provide one world-class output.
Thanks
Pinal
TBI