Much like digital-first financial institutions are steadily capturing market share from traditional banking giants encumbered by aging infrastructure, American startup Rillet is pursuing a parallel transformation within the accounting sector. The company's artificial intelligence-powered accounting platform has already secured a firm foothold domestically, and it is now setting its sights on a major European rollout, highlighted by the launch of a London office this week.

“We’ve already got British clients using our technology, but it turns out that people like people,” explains Nicolas Kopp, CEO and co-founder of Rillet. “Both customers and prospective customers have been urging us to come local – to put people on the ground in the UK with whom they can build human relationships.”

First interviewed in August 2025 shortly following the company's California debut, Rillet has since expanded its global footprint to exceed 800 customers, accompanied by rapid revenue growth. In the three-quarter stretch leading up to its $100 million Series C funding round in August of this year, the firm's annual recurring revenues doubled.

The Strategy Behind Physical Expansion

At first glance, establishing physical operations in London might seem contradictory for a digital-native accounting software provider. Kopp and his team engineered an entirely new suite of digital financial products rather than retrofitting legacy solutions for the modern era. Naturally, one might assume clients seeking such innovation would care little about geographical presence.

“Within a year of launching in the US, we already had finance teams in the UK running on Rillet – we didn’t have a dedicated local team and almost no marketing, yet they still found us,” Kopp acknowledges. Nevertheless, he emphasizes that European clients place a high value on face-to-face interactions, and local market teams will accelerate international scaling. “Having a local presence means we can better understand our customers’ needs and support them on the ground.”

Overcoming Competition and Expanding Verticals

Rillet's primary challenge lies in replicating its domestic triumph abroad, where its clientele ranges across various sectors and includes multiple public companies. Kopp is adamant about avoiding the pigeonhole of being perceived strictly as a tech-focused vendor. While current UK users include technology enterprises, the platform serves diverse real-world operations, with Kopp expressing particular pride in a North of England chicken farmer who has integrated the software.

However, the competitive landscape is fierce. Established heavyweights such as Sage, Intuit, and Xero have poured massive investments into artificial intelligence and digital functionality, cementing their dominance among small and medium-sized enterprises throughout Europe. Meanwhile, enterprise-tier giants like SAP and Workday continue rapid innovation, leveraging native AI capabilities as a core value proposition.

“What we give clients is a real-time view of what’s happening in their businesses,” Kopp says. “When CFOs want to make decisions on the basis of data, it can take days or weeks to get that information out of traditional accounting products whereas we can generate it in seconds.”

Early adopters are already validating this approach. Black Forest Labs stands among the pioneering European entities to deploy Rillet's software.

“When I joined Black Forest Labs, I really wanted to build a finance function that embodied our company’s ambition of pushing the frontier of what was possible,” notes Dave Arkell, CFO of the German enterprise. “We need AI that’s built into the architecture, with reliable data that we can both act on and interact with.”

Furthermore, Kopp highlights that the company remains open to collaborating with legacy market leaders, having already forged strategic partnerships with major advisory firms like EY and RSM. “It’s an opportunity to innovate together and to bring products to market jointly,” he concludes, noting it also strengthens Rillet's brand recognition in sectors where digital solutions are only beginning to gain traction.