Moving from New Zealand to Ireland

Hi, my sister is Irish and is moving home from New Zealand. Her boyfriend who is from New Zealand wants to come back with her. He is 35 and works as a retention specialist, he is also a trained fitness instructor. We are finding it very difficult to get information here in terms of what he needs to do to be able to stay here. Does he need to have secured employment before he moves over? that in itself seems impossible as I doubt anyone will hire somebody living in New Zealand. They arent together long enough for him to come over as a De Facto Partner. Has anyone any experience with this? We so want them to come here, om hoping it works out. Thank you.