Rexi's $1.2M pre-seed bets on AI to untangle Latin America's money-moving mess
There is a quiet crisis inside every high-volume money mover in Latin America: the back office. While neobanks and payment processors grab headlines for sleek apps and explosive user growth, armies of analysts still wrestle with spreadsheets, trying to match transactions that never quite line up. Rexi, a startup founded by three Argentines with deep roots in the region's fintech ecosystem, just raised US$1.2 million in a pre-seed round to attack that problem with an AI-first operational layer. The money comes from a syndicate that includes Underscore, Flybridge, Pear, NFX, Textbook, and Carao Ventures — a mix of US venture funds and a Latin American player that knows the terrain.
The company, incorporated in 2025 with a commercial base in New York and engineering in Buenos Aires, builds software that automates reconciliations and tightens control over financial flows for clients that move money constantly: banks, neobanks, and payment processors. The pitch is not just detection but resolution. Rexi's architecture is designed to absorb operational complexity, learn the rules and exceptions unique to each organization, and continuously adapt as data and business requirements shift. In plain terms, it replaces the tedious, error-prone human matching of transactions with an agent-based system that gets smarter the longer it runs. The founders — CEO Ignacio Berardi, Teo Zavalia (who spent time at Mercado Pago and FJ Labs), and Sebastián García (with stints at Mercado Libre, Naranja X, and Pomelo) — know exactly where the pain lives.
That pedigree matters. Mercado Pago and Mercado Libre are the twin pillars of Latin America's digital economy, and Pomelo is a fast-rising payments infrastructure player. These are not outsiders looking in; they are insiders who built and scaled the very systems that now generate mountains of reconciliation headaches. The region's fintech boom has produced hundreds of companies moving billions of dollars daily, but the plumbing underneath remains fragmented and manual. Rexi's bet is that AI can finally automate away the drudgery, and it is doing so by working directly on raw data — avoiding the heavy integrations and professional services that typically slow down enterprise software adoption. That is a deliberate contrast to legacy players who sell implementations, not outcomes.
For an international reader watching South American capital flows, this round is a signal beyond the modest ticket size. The presence of US funds like NFX and Flybridge alongside Carao Ventures points to a growing pattern: global investors are willing to back Argentine technical talent building for developed markets, even when the company's operational base stays in Buenos Aires. The founders are part of a broader diaspora of engineers and operators who cut their teeth at Latin American unicorns and are now launching their own ventures. Rexi's plan to use the capital to expand its team, develop its business model, and push into the US market reflects a strategy that is becoming standard for the region's most ambitious startups: build the product where talent is cheap and deep, sell where the dollars are.
The deeper story is about operational maturity. Latin America's fintechs have spent the last decade winning customers; now they need to run profitably and safely. Regulators are tightening scrutiny, investors are demanding efficiency, and the era of growth at all costs is over. A platform that automates reconciliation and strengthens control over financial flows is not a luxury — it is a prerequisite for scaling without blowing up. Rexi's focus on resolving discrepancies rather than just flagging them, and on connecting internal teams with external partners, speaks directly to that need. The company is also eyeing verticals beyond banking and payments, such as marketplaces and retail, where transaction volumes create similar operational chaos.
Looking ahead, the real test is whether Rexi can convert its AI-first promise into durable customer relationships. The founders are betting that their experience inside the region's biggest fintechs gives them credibility that generic software vendors lack. If they can prove the platform works at scale in the US while keeping the development engine humming in Buenos Aires, they will have built a template for a new kind of Latin American tech company — one that competes on operational intelligence rather than consumer hype. For now, $1.2 million is seed money, not a revolution. But in the hands of people who have already lived the problem, it is enough to start rewriting the back office.
