Rob Smedley and Felipe Massa will be reunited this weekend as the Brazilian's former race engineer begins working with Williams.
With Massa leaving Ferrari at the end of last season, Smedley also opted to take up a new post and signed on as the head of vehicle performance at Williams.
This weekend will mark his first race with Williams with the 40-year-old set to take over as the man in charge on the pitwall.
"He'll be track and I will be factory and testing," chief test and support engineer Rod Nelson told Autosport.
"I'll do the tests through the season and go to the races that precede those just to get up to speed with where the race team is with the car.
"We will have quite a bit of interplay between us through a race weekend as I'll be running the control room at Williams and he will run the pitwall."
He added: "When you are racing, you need good communication with the factory because you are after quick turnarounds.
"If you have a problem on Friday, you want it solved on Friday but that's always an issue, keeping lines open all the time."