"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.