Toso studied automotive design and electronics at Apeldoorn Technical College, followed by a degree in automotive engineering. He then obtained his masters in aerodynamics and flight at Cranfield University in the UK. He worked at NLR - Netherlands Aerospace Centre until 1995, when he was recruited by BMW for its GT racing programme. In he moved to the Jordan F1 team, where he worked as a race engineer. His time at the team included its first win at the 1998 Belgian Grand Prix, where he engineered driver Damon Hill's victorious car.