The MIT-trained engineer who decided taste is a form of intelligence - and turned that bet into a $1.5 billion creator-commerce platform. One rule holds the whole thing together: if a creator does not like it, they do not post it.
Harry Rein, caught between an engineer's mind and a curator's eye.
Right now Harry Rein runs a company that moves more than a billion dollars a year and refuses to let a brand buy a single honest word. ShopMy, the platform he co-founded and leads as CEO, will happily mail a creator a free serum, a handbag, a pair of sneakers. What it will not do is guarantee the post. If the creator tries the thing and shrugs, the thing goes unmentioned. That restriction is not a marketing slogan stapled on after the fact. It is the load-bearing wall.
"We only allow authentic recommendations," Rein has said. "Brands can gift products to creators to try, but if they don't like it, they won't post. We have to restrict this because authenticity is everything." It is a strange thing for a commerce company to optimize for - the right to say nothing. Most of the ad industry is built on the opposite premise. Rein built ShopMy on the suspicion that the opposite premise was quietly rotting, and that the next decade belonged to recommendations people actually believed.
The numbers suggest he read the room correctly. ShopMy reached a $1.5 billion valuation in the fall of 2025. Roughly 200,000 creators now keep storefronts on the platform, up from about 40,000 in 2023. More than 1,200 brands pay to be there. Over a billion dollars in transactions flow through annually. And in a startup era defined by cash bonfires, ShopMy did something almost rude: it turned a profit in 2024.
Rein frames where this is all heading with a small act of vocabulary rebellion. He would rather you stop saying "creator economy." He calls it the curator economy. The distinction matters to him. A creator makes content. A curator makes choices, and choices - good ones, trusted ones - are the scarce resource. The platform's newer "Circles" feature leans directly into this: personalized shopping routed through social trust networks rather than an algorithm guessing what you might impulsively grab at midnight.
What is easy to miss in the headline numbers is how unfashionable the underlying discipline has become. ShopMy did not subsidize its way to scale with a war chest of venture money lit on fire. It built five revenue streams that each take a small, honest cut of value that already exists - a commission here, a subscription there, a campaign fee somewhere else - and let them compound. The result is a business that grows because the people on it make money, not because the company keeps paying them to stay. That is a quieter flywheel than most consumer apps run on, and a sturdier one.
It also explains the company's odd posture toward its own users. ShopMy spends a great deal of effort protecting creators from the thing that usually corrodes these platforms: the slow drift toward pay-to-play, where the loudest sponsor wins and the audience stops believing anything. By refusing to let brands purchase a guaranteed post, Rein keeps the recommendations expensive in the only currency that matters - sincerity - and cheap in the one that does not.
Brands can gift the product. They cannot buy the post.- Harry Rein, on why authenticity is non-negotiable
The first version of ShopMy did not look like a $1.5 billion company. It looked like a side project, because it was one. Rein was working as an engineer at Popcart, a price-comparison startup, when he and Christopher Tinsley - a classmate from MIT - began building the prototype after hours. The early interface wore a turquoise-and-pink color scheme that, in hindsight, nobody defends.
The fix arrived in the form of Tiffany Lopinsky, who joined Popcart in 2018. Rein showed her the prototype. She saw what it could be, joined as the third co-founder, and promptly threw out the palette, replacing it with the minimalist black-and-white look ShopMy still wears. The three launched officially in July 2020 - a curious moment to start a company built around people leaving their homes to shop, and a fitting one for a company built around people who never needed to.
Rein's path to that prototype ran through code, not commerce. He earned a Master of Engineering at MIT in artificial intelligence and human-computer interfaces, finishing in 2016, and built an e-tutoring startup as a student. Before ShopMy he wrote software at Oracle and at edX, then took the first-engineer seat at Popcart - the job where he happened to meet his future co-founder.
That engineering instinct still shows up in how he talks about product. He describes design in terms of "calories" - the goal is to cut the unnecessary ones, to make the interface lighter so the taste underneath can do the work. It is the kind of metaphor an AI researcher reaches for when he has spent years thinking about how humans and interfaces actually meet.
$4 million to roughly $80 million in two years, with a profit stop in the middle. The chart does the bragging so Rein does not have to.
Estimated annual revenue. Source: Sacra. 2025 figure reflects ~196% year-over-year growth.
Earns an M.Eng. at MIT in AI and human-computer interfaces. Builds an e-tutoring startup while still a student.
Writes software at Oracle and at edX before chasing the startup itch.
Joins Popcart as an early engineer. Meets Tiffany Lopinsky, his future co-founder.
Builds the ShopMy prototype with MIT classmate Christopher Tinsley as an after-hours side project.
Launches ShopMy with Tinsley and Lopinsky.
ShopMy announces an $18.5M round and, more unusually, reaches profitability.
Closes a $77.5M Series B led by Bessemer Venture Partners and Bain Capital Ventures.
ShopMy hits a $1.5 billion valuation.
ShopMy is not one business. It is a multi-sided marketplace that earns from every corner of the creator-brand handshake.
Creators pull products from thousands of brands into a personal storefront and earn commissions, typically 10-30%, on what their followers buy.
Brands pay a monthly fee, reportedly ranging into the thousands, for the tools to find, gift, and track creators.
The platform takes a slice of gross merchandise value flowing through every transaction.
Lookbooks let brands send products to creators to try - no guaranteed post, by design.
Campaign marketplace where brands run paid creator collaborations, with the platform taking a cut.
Personalized shopping through trusted social networks - the curator economy made literal.
Stop calling it the creator economy. The scarce thing is the choice, not the content.- The Rein worldview, paraphrased
ShopMy traces back to a research project at MIT, where Rein and Tinsley met. The company is headquartered in New York but its DNA is a campus lab.
That turquoise-and-pink first draft? Co-founder Tiffany Lopinsky scrapped it for black-and-white the moment she joined. Sometimes the best engineering decision is hiring someone with taste.
ShopMy's backers include not just Bessemer and Bain but creators themselves, plus names like Sofia Richie and Aimee Song.
Rein subscribes to a "sweep the floors" leadership style - founders staying close to the foundational, unglamorous work rather than floating above it.
He talks about cutting "calories" from a product. Fewer features, lighter interface, more room for the recommendation to breathe.
Named to the Vogue Business 100 Innovators list alongside his co-founders, and a BeautyMatter NEXT 2024 Innovator of the Year finalist.
Strip away the funding rounds and the valuation, and Rein is making one wager over and over: that intentional beats impulsive, that a trusted human's pick will outlast an algorithm's nudge, and that the companies who protect that trust will be the ones still standing when the novelty of infinite feeds wears off. ShopMy's competitor LTK had a decade's head start, having launched back in 2011. Rein's answer was not to out-spend it but to out-trust it - to make the platform the place where a recommendation still means something.
The investors lining up behind that thesis are not casual. The January 2025 Series B, $77.5 million, was led by Bessemer Venture Partners and Bain Capital Ventures, with Avenir also in the mix. The cap table reads like a hedge against the cynical view of the creator economy: institutional money sitting next to the creators themselves, plus tastemakers like Sofia Richie and Aimee Song who use the product they are funding. When the people who would know best put their own names on the line, it tends to mean the thing actually works.
Whether the curator economy is a genuine shift or a founder's framing, the platform underneath it is real, profitable, and growing fast. For an engineer who once spent his MIT years studying how people and interfaces meet, it is a fitting place to land - building the seam where taste, trust, and commerce finally agree to share a screen. He has been an engineer, a fundraiser, and an operator who still sweeps his own floors. The throughline is a refusal to settle for the outdated way of doing things, and a stubborn belief that the honest version of a business can also be the bigger one.