"Inspired by the Occupy Wall Street movement, we want to address the real issues and help create game changing solutions to some of the industry's biggest problems," it states. 

"How can we utilize modern technology  to disrupt the current banking systems to benefit the customer?"

But the event organizers, which runs from Friday to Sunday, aren't stragglers from the 2012 Occupy Wall Street movement.

It's one of UK's hottest unicorns: TransferWise, a fintech startup which helps customers transfer money abroad through low cost transfers. 

Revolution, not evolution

"We want this to be a revolution in finance and not evolution," Michael Goodbody, a spokesman for TransferWise, told Business Insider.

"This is the start of something very fundamental. It's very inflammatory language to get people to think about it in a revolutionary way of improvement in an industry that is being disrupted and will continue being disrupted." 

At the hackathon, a healthy mixture of investment bankers, coders, entrepreneurs, and some Columbia University students are expected to pitch solutions to what they consider problems with the existing financial system. The event, which originally capped off at 100 attendees, now has 165 RSVPs.