“Add to this some major heavyweights investing in and backing the business, and you have a potential success on your hands,” he says.

“I say potential though, as even with a good idea, good marketing, good investors and good backing, nothing is guaranteed in this world.

“However, along with Monzo, Starling, Revolut and a number of other UK fintech start-ups, TransferWise is a standout from the crowd and is transforming financial services by targeting great customer experience at the lowest cost through technology.”

While Kristo has the chief executive title, he says that he and co-founder Taavet, 37, have “from the beginning both been involved in everything. We are very overlapping in what we do.”

When not working, Kristo likes to relax by kite surfing, and every Christmas and New Year he goes long-distance motorcycling in Africa with his brother.

“There were lots of unknowns when we started,” he says. “Would anyone trust this website set up by two Estonian dudes? Would anyone else have this problem that we wanted to solve?

“And all these people around the world did have the same problem, and they did trust us.”