If we can used React Native then it ill be good, i have done 2-3 project on that and i am very satisfy with performance and UX features of React Native,
Second Option will be Ionic, its used Angularjs its also good i have used that.
My suggestion is go with React Native.
Agree on payment terms
payment terms :
1- stage 1 is 10% of the full amount
2- stage 2 is 5% of the full amount
3- stage 3 is 35% of the full amount
4- stage 4 is 50 % of the full amount
I am expertise in Mobile Application development and have more than 8 year of experience,
Worked in :- Android Native,Kotlin, Swift, IONIC Framework, React Native,Firebase.
Mobile App :- Cricawaaz, 2degrees,Hapcard, MyCanvas, Route Finder, Studydunes Helping Hand,My Music,My Movies,GRUPIO,Pocket Toons,MagiMoji, Emojis of Magic,Animal game for toddlers,Photo Mirror,Animal Book,Doodle Food Expedition.
Note: These apps (My Music And My Movies) are Inbuilt on Samsung Duos and new 7 inch Tab.
IOS APP:-Dadj, TapOff
IONIC Framework app:- AVM DEPT Connect,
React Native Apps :-PMP Mock, Dating app