DoorDash Inc. is partnering with sidewalk-robot developer Serve Robotics Inc. for autonomous deliveries across the US, adding to an array of methods the company is exploring to complement human couriers.

Serve’s robots will fulfill some DoorDash orders through a multiyear partnership, starting in Los Angeles, the companies said Thursday in a statement shared with Bloomberg News. Serve, which also counts DoorDash rival Uber Technologies Inc. as a partner, has completed tens of thousands of deliveries in five US cities: LA, Miami, Dallas, Chicago and Atlanta.

Neither partnerships is exclusive, meaning Serve can optimize its robots’ time by taking orders from both DoorDash and Uber, similar to how delivery workers toggle between multiple apps to find better-paying or nearby gigs. Shares of

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