Another top Uber exec departs, this time for a San Francisco food delivery startup. : Another top Uber executive has departed the ride-hailing company, this time for Tony Xu’s San Francisco food delivery startup DoorDash. DoorDash announced on Thursday that it has hired Prabir Adarkar as its first chief financial officer, a sign that the “unicorn” startup, valued at more than $1.4 billion and backed by SoftBank and Sequoia Capital, is growing up. Prabir led Uber’s Global Finance team of more than 500 employees.