Gary Paffett, formerly of McLaren, has joined Williams as their new simulator driver.
The 34-year-old Briton, who won the German DTM series in 2005, completed almost 5,000 laps as a test driver for McLaren.
He was in contention for a full-time race seat alongside Fernando Alonso for the 2008 season, but lost out to Lewis Hamilton.
Paffett left McLaren in 2014, but has now landed a role at Williams following the departures of Susie Wolff - who has retired from motorsport - and former reserve driver Adrian Sutil.
"I am really pleased to be joining the Williams team as the simulator driver to aid in the development of this year's car," Paffett said.
"The team has such a great pedigree and history in Formula One. I look forward to supporting the team over this year in my new role."
Claire Williams, deputy team principal, added: "We're delighted to have someone with Gary's experience join us at Williams.
"He is a highly professional racing driver and his level of testing knowledge, and ability to analyse data, will significantly help to drive forward development of the FW38 throughout the season."