Not in the UK, Diamond are located in Canada and Austria. It's likely that to work in Austria you'd need citizenship of an EU country.
I applied for a very interesting looking FTE job there working on the DA42 a couple of years ago. Regrettably they didn't even have the courtesy to acknowledge it - so no idea I'm afraid.
That said, it's likely for a company in that area for FT to be FTE driven, with a small number of developmental test pilots also doing what production test flying is needed to keep their hours up - but that's just informed guesswork, I don't actually know how they work.
Presumably you've looked at their
website?
G