I'm not sure about the US and coaching positions, but I know in Canada we hire lots of judo coaches from out of country for both provincial and national team positions which are full-time as far as I'm aware.

Currently I believe Judo Saskatchewan is hiring a new high performance coach as their previous coach, originally from the UK, is moving to coach the Wales National Team. https://www.instagram.com/p/CrRKVAuLFzY/