The register
The register lists Substrakt Ltd in Birmingham 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 Substrakt Limited, number 05916054, incorporated 2006: 20 years of filings behind the name. The registered office is at The Jointworks, 45 Frederick Street, Birmingham, B1 3HN, B1 3HN. Its filed activity puts it 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.