The register
The register lists GasEntec UK 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 the business as Gasentec UK Limited, company number 16624857, a private limited company. The registered office is at Lynton House, 7-12 Tavistock Square, London, WC1H 9BQ, WC1H 9BQ. By its SIC codes the business is 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.