Peter Zhou

A six-figure deal closed on a slide deck and a hunch.

Before Rutter had a finished product, it had customers. Peter Zhou and his co-founder Eric Yu were selling something that mostly lived as API documentation and a few slides. Companies signed anyway. "We ended up closing $100k in annual contracts in the first two months," Zhou recalls. That is not a launch. That is demand kicking the door down.

The thing they were selling sounds dull until you need it: a single, consistent way to read and write business financial data across platforms that refuse to agree with one another. Accounting software like QuickBooks, Xero and NetSuite. Commerce platforms like Shopify, Amazon and WooCommerce. Payment rails like Stripe and PayPal. Each one speaks its own dialect. Rutter is the translator. Build a financial workflow once, ship it in days instead of months.

The shorthand people reach for is "Plaid for commerce." Zhou earned it. Where Plaid made bank accounts programmable, Rutter is doing the same for the messy ledger of how businesses actually buy, sell, and get paid.

The years that didn't work

The slide-deck win reads like luck. It wasn't. For roughly three years before Rutter, Zhou and Yu built startups that went nowhere. The high-water mark of that era was a single contract worth $6,000 a year, from a Series C company. Three years. Six thousand dollars. Most people quit at less.

What those years bought them was a nose for fragmentation. Zhou kept running into the same wall: every company wanted to plug into commerce data, and every company was building the same brittle integrations from scratch. "What surprises people is that this is more fragmented than people thought," he says. The market wasn't crowded. It was empty in exactly the place that mattered.

So they stopped building the front-facing product everyone wanted to build and started building the unglamorous layer underneath it. The plumbing. The part nobody screenshots.

Domain mapping, or: deciding what a "product" even is

Ask Zhou what the genuinely difficult problem is and he won't say scaling, or sales, or hiring. He'll say abstractions. When a "customer" in Shopify and a "customer" in NetSuite and a "customer" in Stripe are three different shapes of data, someone has to decide what the universal version looks like. Get it wrong and every integration downstream inherits the mistake.

That work - he calls it domain mapping - is the core technical challenge of any universal API, and it doesn't show up in a demo. It shows up years later, when a customer asks for the one field nobody anticipated and the schema either bends gracefully or snaps. Rutter's bet is that getting the abstractions right is the whole game.

$27M, and a room full of people who'd done it before

In March 2022, a16z led a $27 million Series A into Rutter, with Kristina Shen joining the board. The cap table reads like a fintech reunion: founders and executives from Plaid, Modern Treasury, Airwallex and Red Hat, plus Basis Set Ventures, Haystack, Comma Capital, Mischief - and, for good measure, the EDM duo The Chainsmokers. Total raised sits near $28.8M.

The plan Zhou laid out was blunt: grow the team from about 19 people to 80 inside a year, because the product was being "pulled out of our hands." When demand outpaces headcount, you hire. The hard part - finding the demand - was already solved.

Doubling down on fintech

Rutter's stated ambition is large and a little audacious: organize the world's commerce data, then become the horizontal platform that glues any financial tool to any merchant on earth. In practice that's meant leaning hard into fintech, where Zhou sees the strongest pull, and extending into B2B payments. By late 2025 the company was demoing AI-powered supplier enablement at FinovateFall - the same connective thesis, pointed at a new corner of the market.

Customers already running on Rutter - Mercury, Ramp, Airwallex, NorthOne, Payoneer - aren't using it for the brand. They're using it because building those integrations themselves is a tax nobody wants to pay. Zhou built the toll road. Quietly. That's rather the point.