VSL International, founded in 1954 as Vorspann System Losinger, is a Swiss-based specialist construction company specializing in post-tensioned concrete, stay-cable systems, and heavy lifting. Headquartered in Bern, Switzerland, VSL operates globally, with a presence in over 30 countries, primarily across Asia, Oceania, the Middle East, Europe, and South America. A subsidiary of the French construction company Bouygues since 1991, VSL contributes to the engineering, construction, repair, upgrade, and preservation of various structures, including transport infrastructure (bridges, tunnels, and retaining walls), buildings, and energy production facilities.