The on-demand delivery company aims to reach every ZIP code in America before its competitors. : The food delivery wars are here, and the weapon of choice is money. DoorDash, an on-demand delivery app, raised a fresh $400 million from venture capital investors, the start-up said Thursday. The financing round values the company at $7.1 billion, and adds to the start-up’s already towering cash pile. Last year, DoorDash raised $785 million from investors. DoorDash’s main competitors, Postmates and Uber, the parent company of Uber Eats, are preparing to go public.