Build mobile app in androide only lower version 4.4.4 from flutter

I need a programmer to develop an application from scratch on Android only the lowest version I can, currently this application is working fine in Frutter, but I need it in Android the oldest version that can be Android 4.4.4 kitkat, which I have a stripe payment gateway, with a credit card reader and can print a usb and ethernet printer, we already have the printer service so that it can print automatically without the print preview, I requested this application is working well in frutter with Everything, the only thing we need is to be able to do it in the oldest version possible to run it in android 4.4.4 kitkat version, our web platform is made in node js and the angular 8 database is MySql @@ careful if you do not know, do not request the work, only applications that have experience in what we are requesting will be accepted,