Selfin Sets Out to Build "the First AI Bank" from San Francisco

Selfin, a Y Combinator Fall 2025 company, is developing what it calls “the first AI Bank”: a consumer platform that connects all of a user’s financial products — checking, savings, credit cards, investments, loans — and uses AI to deliver personalized recommendations and continuous optimization. The company’s pitch is that while existing neobanks stopped at better onboarding and slicker interfaces, the next generation of consumer finance will compete on financial outcomes: putting every user’s money into the right account, at the right rate, working in the right way, automatically.

Founded in 2025 and based in San Francisco, Selfin was built by Paula Gutierrez and Joel Tomas Pimentel, a two-person team with a strikingly technical background for consumer fintech. Gutierrez studied aerospace at Imperial College London with stints at MIT and UC Berkeley, and worked as a quant at Bank of America, NASA, and Rolls Royce before moving into startup software engineering. Pimentel trained in rocket science at Imperial and Stanford before pivoting into fintech. The founding story — two rocket scientists deciding banking is the next frontier — is the kind of origin tale YC partner Tom Blomfield, who is backing the company, has helped surface before. Blomfield himself co-founded Monzo, one of the original consumer neobanks, giving Selfin unusually fitting mentorship for its ambition.

The neobank wave of the 2010s proved that consumers would switch banks for a better app. Now Selfin is betting that the next switching moment will be driven by AI — and that the winner will be a bank built, from day one, around personalized intelligence rather than polished UX.

The market context is instructive. Consumer finance apps have proliferated, but the experience remains fragmented: a checking account here, a brokerage there, a high-yield savings account somewhere else, a credit card or two on top, plus whatever buy-now-pay-later or crypto product the user has signed up for. Each optimization — moving cash to a higher-yield account, refinancing a card, rebalancing investments — requires manual attention most people never give it. Selfin’s thesis is that AI can close that gap, acting as an always-on financial co-pilot that understands a user’s full balance sheet and executes on their behalf.

That’s a big technical and regulatory bet. AI-driven financial recommendations live in a compliance-heavy zone, and consumer trust is notoriously hard to earn in banking. But if Selfin can deliver even modest gains — better rates, smarter allocation, fewer fees — at scale, the lifetime value per customer could dwarf the acquisition costs. And unlike legacy banks, Selfin has no existing revenue stream to cannibalize, which means it can design for the user’s financial outcome rather than the bank’s.

With a small team, a focused thesis, and strong YC pedigree, Selfin is one of the more ambitious Fall 2025 companies to watch. The consumer fintech category has been relatively quiet in recent years as investors cooled on neobanks, but AI-native entrants like Selfin could reinvigorate the space by competing on a dimension — personalized optimization — that incumbents simply can’t match at scale.