The founder may not want to pay their engineer more (the founder doesn't even recognise the engineer's tie, for a start) but there are only so many competent people so if you want one you just have to put your hand in your pocket even if you don't like it.
I absolutely cry when I see people looking at £28k starting salaries in the UK. People don't know how bad they have it compared to what they could be getting. They should take remote jobs with Canadian or American companies and forget about British companies, I'm afraid.