looking to launch my app in android and ios both hybrid technology needed react native or flutter with admin panel

so basically i am looking to launch into new business, it will comprise of many things 1. selecting city which city service needed 2. boat booking 3. sports adventarous activites 4. premium hotel bookings which are famous ( 3rd part api we can do , but this is very unique will give details on based of speciality of that hotel what it is for) 5. any other various services we can add like cab booking or so but our main will be boat booking in that many thing time wise , event wise customize boat bookng etc that is main thing. we need some one individual so after makign he be there to keep modify or solve if any issues. either we can work in partnerships for few months or we can pay developer one time payment choice is yours