The register
The register lists BOSS Professional Services in 1-3 Brixton Road as a licensed sponsor on Skilled Worker, an entry that goes back to at least 2026. Its rating on the register is Worker (A rating).
Boss Professional Services Limited is the registered name (Companies House number 08727514), a private limited company on the register since 2013. Registered office: 101 Lincoln House 1 Brixton Road, Kennington, London, SW9 6DE, SW9 6DE. By its SIC codes the business is in recruitment and employment agencies.
Holding a licence is the expensive, slow part done. For BOSS Professional Services the question each time is only whether the role and the pay fit the current rules, and that is checked per vacancy.