Breadcrumb Switzerland Newsroom Press Releases STEF And QSL Join Forces To Support The Growth Of Their Client Burger King In Portugal PARTNERSHIP 28/08/2023 STEF and QSL join forces to support the growth of their client Burger King in Portugal The first six months of STEF and QSL working together in Portugal to support their client Burger King have been positive. STEF and QSL join forces to support the growth of their client Burger King in Portugal Download the press release (pdf, 282.57 KB)