Mark Webber and Kimi Raikkonen will be working with new race engineers this season after swapping personnel.
Ciaron Pilbeam, who has worked with Webber since the Aussie joined Red Bull back in 2007, is heading over to Lotus where he will be taking the role of chief race engineer.
Meanwhile, Raikkonen's 2012 engineer Simon Rennie will be heading in the opposite direction to Red Bull where he'll team up with Webber.
A Red Bull statement said: "We can confirm that Ciaron Pilbeam has left the team to take up a new position with Lotus.
"We're pleased to welcome Simon Rennie to Red Bull Racing who will be Mark Webber's race engineer."