Hi there
We can't use old code, but yes, we can build all apps on one flutter app like a pro with seven years of experience in programming.
Message me if you like.
I give you full support of the application and one month of free support after the end of the project.
All source code and results are shared with you.
You can track the process of the app on Trello and have code in git at the end of work.
All parts of the app will build by the best architecture and design pattern to help you grow your app in the future and add new users to it, also easy to add new features
Do not forget to be in contact with me