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He needs a work visa before he may come to the UK to work for you.
The usual category is a Tier 2 general visa and you need to be a licensed sponsor: https://www.gov.uk/government/collections/sponsorship-information-for-employers-and-educators
Getting licensed is a complicated process unfortunately.
May I help further?
There are several firms that assist with this e.g. https://www.davidsonmorris.com/tier-2-sponsor-licence-application/
All the best