Possible, yes. But an awful experience if you don’t have a physical keyboard, even one of those cheap bluetooth ones. It’s barely bearable if you have one, since the screen is still too small.

On Android, I can vouch for Acode and Xed-Editor, both available on F-droid, as code editors to help you program. Not ideal, but if you have no other option than using your phone to program, they’re good choices.