There has never been a bug which I couldn't fix.
A such I can guarantee that I will be able to resolve your issue of the Login Activity crashing on Samsung Galaxy S6 devices.
I have a S6 in my hand right now, all I need to get started is your app's source code. It will take me less than a day to fix this crash. No upfront payment. I get paid when the job gets done.
You will not find a better Android developer for fixing this bug. Of course these expertise come at a price.
I trust you will make the right decision and select me for this project.
I look forward to hearing from you.
Kind regards,
Alexander Farrow