Alessandro Cinelli, a 17-year Ferrari veteran, will move from Maranello to Hinwil where he will oversee Alfa Romeo racing's aerodynamics department.
Cinelli will report directly to the team's technical director and former aero chief Jan Mondchaux who was recently promoted to the post following the return of Simone Resta to the Scuderia.
Cinelli, who was Head of Aero Experimental Group and covered various other positions within Ferrari's Aerodynamics department, is scheduled to begin work with Alfa Romeo on August 19th.
"I am delighted to welcome Alessandro to Sauber Motorsport and Alfa Romeo Racing," said Alfa team boss Frédéric Vasseur.
"He joins a strong aerodynamics team and we are eager to see them continue the good work that was done so far.
"The recent appointments show how we continue to strengthen our structures and represent an evolution, rather than a revolution, of the system that has helped us progress in recent years."
On his role with Alfa Romeo, Alessando Cinelli said:
"I am really excited about my appointment at Sauber Motorsport and I am looking forward to the challenge of leading an extremely talented group of people as Head of Aerodynamics," the Italian engineer said.
"I join this young team with the mission to build on the solid foundations that have already been laid and to help produce results on track.
"I am confident we can continue on the right direction and bring even more success to the team."