DoorDash has raised another $600 million in venture capital funding. : More than five years ago, Sequoia partner Alfred Lin called Tony Xu, the founder of a small on-demand delivery startup called DoorDash, to say he was passing on the company’s seed round. This was, of course, before venture capital funding in food delivery startups had taken off. DoorDash, launched out of Xu’s Stanford graduate school dorm room, wasn’t worth Sequoia’s capital — yet.