Jay Heller has spent much of the last three decades helping companies ring the opening bell.
During his 18 years at Nasdaq, he worked on more than 3,000 public listings, including some of the biggest names in tech. After a career spent helping other founders reach the public markets, he decided it was finally time to step back into startup life himself.
That decision led him to Miami-based fintech K Lab, where Heller recently became CEO alongside founder Paolo Fidanza, the entrepreneur behind KEO World, which exited in a $680 million strategic merger.
“There was a hunger and a drive for me to be part of something truly special on the private side,” Heller told Refresh Miami. “I looked at it this way: I can sit in this seat at Nasdaq for the next ten years. But I asked myself, if not now, when?”
K Lab is tackling a problem most people never think about until something goes wrong: how money moves between governments, financial institutions, and businesses.
The company doesn’t replace payment networks. Instead, its K Rails platform sits above existing systems, validating transactions before money moves while creating a transparent record of every step.
“We’re not the ones that actually move the payments,” Heller explained. “We’re the ones that validate how capital and payments should move.”
Rather than asking governments or banks to overhaul their infrastructure, K Lab adds an intelligence layer that verifies participants, performs compliance checks, and helps create an auditable record of transactions.
“What we do is provide the rails, and we allow the government and financial institutions to set the rules,” he said.
Artificial intelligence helps automate tasks like know-your-customer (KYC) and anti-money laundering (AML) checks, speeding up payment approvals without sacrificing oversight.
“The AI brings efficiency,” Heller said. “It’s speed. It comes back to that.”
Blockchain provides another piece of the puzzle.
While Miami has become known for cryptocurrency headlines, Heller believes blockchain’s biggest opportunity lies in practical business applications. He points to the technology’s ability to create permanent, transparent audit trails rather than focusing on speculative assets.
“Regardless of whether it’s securities or payments, having accessibility to that audit trail is really important,” he said.
K Lab launched last year after spinning out technology and talent from KEO World. Today, the company has about 60 employees across the U.S. and Latin America and is taking a measured approach to growth.
“We’re being very thoughtful about where we place people,” Heller said. That same philosophy applies to expansion. While the company ultimately hopes to grow globally, its immediate focus is the U.S., with Miami serving as its headquarters.
For Heller, the city offers a natural gateway between North and Latin America, alongside a growing concentration of financial institutions and fintech talent.
“Miami is just the perfect spot to be,” he said.
Although Heller spent years helping companies prepare for public markets, he says K Lab’s focus today is much simpler.
“We’re going to be very structured and very disciplined,” he said. “The one thing we’re not going to do is overpromise and underdeliver.”
READ MORE IN REFRESH MIAMI:
- KEO World’s $680M merger fuels global expansion of its B2B credit platform
- A fintech founder turned down $200 million. Here’s why he doesn’t regret it.
- How Miami became a launchpad for cross-border payment startups
- alfred wants to make Latin America feel like one country… at least for global payments
- Remitian raises $7M to tackle the messy final step of tax filing
- Flex lands another $70M as it bets the future of banking belongs to business owners, not businesses – July 14, 2026
- Nasdaq’s IPO whisperer is betting his next chapter on fixing institutional payments – July 14, 2026
- Meet the fractional executives behind some of Miami’s fastest-growing startups – July 13, 2026
