With a few clicks, Molder places her order on an application on her mobile phone and 20 minutes later the robot arrives with her lunch. It had no trouble climbing a paving stone in front of Molder's block of flats, but unable to press the entry buzzer, it sends a message to her phone.
"Knock-knock! Your Wolt delivery is arriving, please come outside and unlock the robot," reads the message with an access code to open the robot's container.
"I'm sure it's going to make some services more efficient," Molder told AFP.
The robots' top speed is around six kilometers (four miles) per hour but they are far less expensive to build and operate than delivery drones now being tested by online retail giant Amazon and others.
Once on the market, the final product is expected to cost "as much as a laptop or a really expensive phone. A few thousand euros," Martmaa said.
Starship partnered with Finland-based Wolt, a company handling food deliveries for over 120 Tallinn eateries.
The robots are "a good addition to our fleet. We have bikes, cars and scooters but maybe the robots will be the best option for the short deliveries in the future," says Matias Nordstrom, Wolt's interim head in Estonia.
For now, Wolt robot deliveries are available from four Mustamae area restaurants. But Starship has its sights set on the US. Similar pilot projects for robotic deliveries of parcels, groceries and prepared foods are being launched in Washington and Redwood City, an IT hub in California.
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Humans still follow the bots around during testing for safety, but Martmaa says they will be fully autonomous in a few months. While its nine cameras and other sensors keep the robots from bumping into humans, exceptions to common traffic rules are tricky.
"The main (concern) are the intersections... In many places in the world there are roads where cars can turn right even if the traffic light is red. Our robot can't detect that," Martmaa said.
Deliveries cost 3.5 euros ($3.7), but Starship wants to slash that to one euro.
Replacing humans with robots on the labor market could however carry a social cost. It runs the "risk of exacerbating the gap between the haves and the have-nots," Peter Stone, who led a 2016 Stanford University study on artificial intelligence, told AFP.
He predicts that over the next 15 years autonomous vehicles and robots will take over unskilled jobs like the transport of people and packages. However, highly-skilled - and paid - jobs developing artificial intelligence devices will emerge.
Microsoft founder Bill Gates has said a "robot tax" - paid by robot makers and users to government - could mitigate the social cost of replacing humans with machines on the labor market.
"I don't think the robot companies are going to be outraged that there might be a tax," he told the Quartz digital news outlet.
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