Generally, I keep work and social pretty separate. I have work friends who I get on with at work and socialise with at work events, but they rarely cross over into my homelife.
This seemed entirely normal for 25 years, as I and my colleagues had long commutes and didn't live near each other so it was how everyone lived.
Now I work much closer to home and no one has a long commute. There are lots of "real" friendships among the staff, although I still prefer to keep things separate. I have the kind of role that often means taking difficult decisions that affect staff and it's easier if you're not too close to anyone.
Anyway, I have a vacancy to fill. For various reasons it's not an easy vacancy to fill. IMO it's underpaid, but it's on a public sector payscale and I can't do anything about that.
I have a friend who is interested. He'd be a strong candidate and I'd be pleased to have him on the team - if only he wasn't my friend. He has has skills and his personality would fit very well. If I have a concern it's that I think he can be quite militant at work, but I consider we are fair employers and I don't object to challenge, so that would be manageable.
I don't want to have difficulties at work or to affect things out of work. Have you ever employed a good friend? How did it work out. He's a significant member of my most important friendship group, so I have a lot to lose of it goes horribly wrong.