The register
The register lists Dolmen Development UK Ltd in Middlesbrough as a licensed sponsor on Skilled Worker, an entry that goes back to at least 2026. Rating on the current register: Worker (A rating).
Dolmen Development UK Ltd is the registered name (Companies House number 12482545), a private limited company on the register since 2020. Registered office: Floor 1 65 Albert Road, Middlesbrough, North Yorkshire, TS1 1NG, TS1 1NG. Its filed activity puts it in construction.
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.