Red Bull has announced that it is promoting Pierre Wache following the departures of two senior technical staff to the Mercedes Formula 1 team.
Giles Wood and Mark Ellis's moves to Mercedes for 2014 were revealed earlier this week.
Wood had been Red Bull's chief simulation engineer, while Ellis was its head of vehicle dynamics.
Wache will take over the latter role with immediate effect.
He had proved been chief engineer for car performance, having joined the champion squad from Sauber earlier this year.
Red Bull also thanked Ellis and Wood on their departure.
"The team would like to thank Mark Ellis and Giles Wood for their contribution and wish them well for the future," said a statement.