The register
The register lists prosource.it in Aberdeen as a licensed sponsor on Skilled Worker, an entry that goes back to at least 2026. Its rating on the register is Worker (A rating).
Prosource.IT (UK) Ltd. is the registered name (Companies House number SC242550), a private limited company on the register since 2003. Registered office: Brimmond House Kingswells Causeway, Prime Four Business Park, Kingswells, Aberdeen, AB15 8PU, AB15 8PU. Its filed activity puts it in it, software and media. It has traded under other names before, including Tetrasource Limited, Prosource (europe) Limited.
A licence says an organisation may sponsor; it does not say it is hiring today. The way to find out is the same as for any employer: the careers page, the job boards, and a direct approach with a UK-style CV that says early that sponsorship would be needed.