The reseller who got tired of posting the same thing ten times

In 2007, a high school kid in Maryland listed something for sale online. Maybe a pair of shoes, maybe a gadget he'd outgrown. What matters is what happened next: he did it again, and then again, and he kept doing it through college, past graduation, and straight into building a company. Most people treat teenage side hustles as a phase. Thomas Rivas treated his as a career that hadn't found its final form yet.

The final form is Vendoo, a software platform that lets online resellers post a single item to more than ten marketplaces at once and manage the whole operation from one screen. It went through Y Combinator's Winter 2022 batch. It is profitable. And by the company's own count, sellers have used it to create more than 26 million listings. But the more interesting number is the one at the start: 2007. Everything about Rivas as a founder traces back to the fact that he was a customer first, for well over a decade, before he ever wrote a business plan.

01The problem was his own weekend

Ask most founders where the idea came from and you get a story about a market they studied, a trend they spotted, a gap in a report. Rivas's answer is smaller and more honest. He was reselling online, and as more marketplaces sprang up - eBay, then Poshmark, then Mercari, then Facebook Marketplace - the work multiplied. Each new platform meant retyping the same title, the same description, the same measurements, uploading the same photos, setting the same price. The selling was fine. The re-posting was miserable.

This is the kind of problem that hides in plain sight because it's boring. Nobody writes think pieces about copy-pasting a listing. But if you are one of the millions of people running a real business out of a closet or a garage, that busywork is the tax you pay on every item. Rivas felt the tax personally, month after month, which is why he trusted that other sellers felt it too. He wasn't guessing at a pain point. He was living inside one.

It helps to picture the actual mechanics. A reseller finds a jacket worth listing. To reach the most buyers, they don't post it once - they post it on eBay, then again on Poshmark, then Mercari, then Facebook. Same photos, re-uploaded. Same measurements, re-typed. Same price, re-entered, four times, for one item. Multiply that by a rack of inventory and the math turns brutal fast. The seller who lists everywhere sells more, but pays for it in hours nobody sees.

Development on Vendoo began in 2017. The pitch that eventually reached Y Combinator was almost aggressively simple: one item, ten marketplaces, one click. Import what you already have listed. Track your inventory in one place. Get analytics that tell you what's actually selling. None of it was flashy. All of it removed hours of manual labor from a reseller's week - and hours, for a reseller, convert directly into more listings and more sales.

02A straight line, no pivot

Startup stories usually come with a hard turn in the middle. The dog-walking app that became a payments company. The failed social network that became a photo filter. Rivas's arc is unusual because it doesn't bend. He sold online. It was tedious. He built software to fix the tedium. People paid for the software. That's the whole shape of it.

The reason the line stays straight is that he never left the world he was building for. Before college he was a seller. During his double major in International Business and Marketing at the University of Maryland he was still selling - and, in the margins, teaching himself to build web and Android apps. The commercial instinct and the technical instinct grew up side by side. By the time Vendoo needed both, he already had them, assembled quietly over years rather than acquired in a rush.

03Profit and growth in the same year

There's a moment in the Vendoo story that Rivas returns to, and it's telling because of what surprises him about it. Reflecting on an early stretch of the company, he said he could never have imagined leading a team of 17 people and being profitable all in the same year. Read that twice. The remarkable part to him wasn't the headcount or the profit on their own. It was having both at once, which the standard startup script treats as a choice you're supposed to make.

The discipline behind that isn't an accident either. When your first business was run out of a bedroom with your own money, profit was never a luxury metric to chase later - it was the only thing keeping the lights on. Rivas brought that closet-business math into a venture-backed company. Y Combinator gave Vendoo a stage and a network, but the habit of spending less than you make came from a decade of selling sneakers and gadgets where every dollar was real.

That team of 17 has since grown to roughly 50 to 60 people. Growth like that usually loosens the grip on costs. In Vendoo's case the early frugality seems to have set a tone that scaled with the headcount rather than dissolving under it.

It's worth noticing what that combination protects. A profitable company doesn't have to raise money on someone else's timeline, and it doesn't have to bend the product toward whatever a new round demands. Rivas gets to keep building for resellers at the pace resellers actually need, because the business funds itself. For a company whose entire promise is giving customers control over their own time, running on its own terms isn't just prudent. It's on brand.

04Building for a room you're already in

Vendoo has four founders, and there's a detail about the team that Rivas hasn't turned into a slogan but that says a lot about how the company was built. All four founders are minorities, and in the early days every employee was too. It wasn't framed as a diversity initiative. It was simply who came together to do the work and who they hired to help. The team ended up looking a lot like the sellers it serves - people who often build businesses outside the usual startup pipelines.

Each founder brought a different piece. Rivas is the seller-turned-builder at the center. Alongside him are a longtime full-time reseller who once ran a sneaker store, an operator who leads customer success, and a technical lead with years of software and design behind the product. Between them, Vendoo has something rare: nobody on the founding team has to imagine what a reseller's day feels like. Several of them have lived it.

You can see that instinct in how the company talks to its market. Vendoo runs The Reseller Podcast, keeps a blog aimed squarely at sellers, and publishes a steady stream of how-to content on YouTube. None of it reads like a software company doing marketing. It reads like people who are part of a community handing over what they've learned. The product is the software. The trust is the moat, and the trust comes from belonging.

05The case for boring ideas

If there's a lesson worth stealing from Rivas, it's about where to look for a company. Not at the exciting problems everyone is already crowding around, but at the annoying tasks people quietly do by hand every day and wish they didn't. Cross-posting a listing is not a vision. It's a chore. And chores, done by millions of people, add up to markets.

The reselling economy is enormous and almost invisible. It doesn't show up in the headlines the way ride-hailing or food delivery did, partly because it happens in spare rooms rather than on street corners. But the people inside it are running real businesses with real margins, and they feel every hour of friction. Rivas built for them because he was one of them, and the fact that the work was unglamorous was exactly why the opportunity sat there unclaimed for so long.

The advantage of that vantage point compounds. When a customer emails Vendoo about a fussy edge case in how a marketplace handles variations or shipping, odds are somebody on the team has hit the same wall while selling their own inventory. That shared context shortens the distance between a complaint and a fix. It also keeps the roadmap honest, because the people deciding what to build next are, in a real sense, building for their past selves.

There's no dramatic origin here, no lightning strike, no dropout-genius mythology. Just a seller who refused to keep doing the worst part of his own job by hand, and who happened to have taught himself enough to build the fix. Fifteen years of listing things online turned out to be the research. Vendoo was the write-up. And the whole thing still runs on the same idea it started with: give people their time back, and they'll do more with it than you ever could on their behalf.

What comes next for Vendoo is more of the same, which in this case is a compliment. More marketplaces, more automation, more of the busywork absorbed so that a person with a garage full of inventory can spend the evening sourcing their next find instead of retyping the last one. Rivas started by trying to get his own weekends back. He ended up trying to give everyone else's back too.