The register
The register lists Alterest Limited in London 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 Alterest Limited, number 09919781, incorporated 2015: 10 years of filings behind the name. The registered office is at 71-75 Shelton Street, Covent Garden, London, WC2H 9JQ, WC2H 9JQ. By its SIC codes the business is in it, software and media.
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.