The register
The register lists PSI Metals UK Ltd. in Watford as a licensed sponsor on Skilled Worker, an entry that goes back to at least 2026. Rating on the current register: Worker (A rating).
Companies House lists it as Psi Metals UK Limited, number 04531997, incorporated 2002: 24 years of filings behind the name. The registered office is at 65, Pendragon House London Road, St. Albans, Hertfordshire, AL1 1LJ, AL1 1LJ. Its filed activity puts it in it, software and media. It has traded under other names before, including Broner Metals Solutions Limited, Shelfco (no.2776) 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.