Hello my name is Ashish.i think i am the person who you are looking for. i have been working for flutter mobile app developer for more then 2 years .i think i can do your work with your requirements . here are the link of some of the work i have done.

https://play.google.com/store/apps/details?id=com.dark.ioeSyallybus.np

https://play.google.com/store/apps/details?id=com.com.blisse.alphabetPuzzle.AlphabetPuzzle

https://play.google.com/store/apps/details?id=com.phoneDiary.np

 https://play.google.com/store/apps/details?id=com.Blisse.MazePuzzle

 if you are satisfied with my works you can feel free to contact me.

 Thank you