Uber has  hired Joe Sullivan to be its first chief security officer, luring him away from Facebook. He also spent four years at eBay as a senior security director, and he was also a federal prosecutor in the Northern District of California’s computer hacking unit. In his new job, he will work alongside Katherine Tassi, Uber’s managing counsel for data privacy.

“This is a chance to help build the culture of a young and growing organization, and to continue building upon the safety and security initiatives that are the backbone of Uber’s success,” Sullivan said in a statement.

The new hire underlines how Uber is fast becoming a prime recruiter in talent-starved Silicon Valley, where young tech companies are willing to pay higher salaries and offer greater perks to win over the best minds in the field.

According to the New York Times, Sullivan will be responsible for overseeing the security of Uber’s vast driver data to improving safety measures for drivers and passengers.

“Joe’s many contributions have made the Facebook community safer and more secure,” a Facebook spokesman said in a statement. “We wish him the best in his future endeavors.”