Before there was an app, there was a notes tab. Zac Stern was in London. His girlfriend was in New York. They had met two weeks before he left to study abroad in 2019, an inconvenient moment to discover someone worth remembering. He began recording the details she mentioned: things about her, things about her family, the small facts that make paying attention visible.
Travel brought another filing system. The couple saved ideas on Instagram, researched addresses and pinned places on a phone map. A romantic weekend required a modest amount of database administration. Stern saw a product in the inconvenience. There were plenty of apps for finding someone. The business of remembering them seemed rather less crowded.
That observation became Official, the couples app Bumble acquired in 2023. The neat version of Stern’s biography could stop there: finance student, venture investor, founder, exit at 25. His subsequent career makes that ending premature. Official would close. Stern would leave Bumble. And the person who once collected fragments about a partner would begin designing software to collect the fragments of a whole life.
The investor crosses the table
Stern studied finance and management at New York University’s Stern School of Business. His early career at Rosecliff Ventures involved the unromantic work behind startup financing: evaluating companies, preparing investment material and helping founders make their cases. His professional profile records an analyst stint in 2017 and an associate role spanning 2019 and 2020.
He had been interested in ownership long before he could prepare an investment memo. For a seventh-grade assignment to dress as an important historical figure, he chose Warren Buffett. Later came a watch business with a friend and three years as college class president. In his own account, he lost the presidency in his senior year after missing meetings while working at the venture fund. Even his extracurricular activities were competing for market share.
Official began taking shape alongside that finance career. Stern dates the nights-and-weekends work to May 2020, incorporation to August and his departure from the venture firm to October. He has described being fired after working on the project. Whatever certainty the associate’s desk offered, he was now responsible for making the other side of the pitch work.
A swipe with a different destination
The investor’s question followed him into the product. A matchmaking service can lose a customer when it succeeds: two people meet, pair off and leave. Official placed its commercial hopes in the life that followed. A couple continuing to spend time together could also continue to have a reason to use the app.
The interface borrowed a familiar gesture. Partners could swipe on date ideas, then discover which activities appealed to both. Shared notes, countdowns and daily questions gave the relationship somewhere to put its unfinished business. Answering a prompt separately before seeing a partner’s response made a conversation easier to begin.
The design also allowed for discretion. Mutual interest could surface without broadcasting every unmatched preference. Stern’s explanation was practical: people should be able to discover something they both wanted to do without turning every tentative suggestion into a negotiation. Some of the product’s work happened in what it chose not to announce.
He also resisted making the app the venue for the entire relationship. Its purpose was to encourage conversation beyond the screen. That leaves a pleasingly awkward assignment for a consumer software company: produce something useful enough that people might put their phones down and go on the date.
“I just want every user to find value on Official.”
Zac Stern, 2022
The day success needed an off switch
Early demand arrived faster than the machinery could accommodate. By December 2021, Official’s early history already included a viral surge, a crash, a rebuild and a financing round of nearly $500,000. Stern had experience studying other founders’ progress; now his own progress included the peculiar embarrassment of attracting people to an app they could not enter.
Years later, he gave the workaround a name: the Kraken. He and Sarah Dempsey, Official’s marketing lead, would make a popular TikTok video private when sign-ups threatened to overwhelm the system. Restoring it to public could bring another surge. They began monitoring views against incoming users and using the switch to manage demand.
In his telling, this started as an emergency measure. The useful discovery came afterward. A video could become something held in reserve, ready to release when the product could absorb the attention. The founder was learning to pace a crowd while the engineers caught up with it.
By September 19, 2022, Stern says the app could withstand a day of roughly 100,000 downloads without that throttle. The figure is his retrospective account, and it describes one day rather than a steady daily rate. Its place in the story is still clear: eventually, the marketing team could leave the video alone.
- 01Video gathers attentionSign-ups begin to climb.
- 02Make it privateEase demand on the app.
- 03Release it againRestore the video when capacity allows.
The exit, and the part after it
Bumble’s acquisition brought Official into a company already operating services for meeting people. Stern became Official’s general manager. He expressed admiration for Whitney Wolfe Herd and an intention to grow the product with the Bumble team. The founder had moved from arguing that couples deserved their own software to running that software within a larger dating business.
Stern sold at 25 and has put Official’s reach at more than 1.5 million installs and 300,000 monthly active users. Those are his historical figures for the business. He also credits his work at Oventure, a syndicate he co-founded, with leading more than $1.1 million in angel investments. Building had not entirely displaced investing.
The acquisition did not guarantee the app a permanent home. Bumble announced plans to discontinue Official in February 2025. The app closed in the second quarter. Stern says he left Bumble in March. A successful sale and a product’s continued existence had become two separate outcomes in his career.
For a founder, that changes the shape of the achievement. The transaction remains real. So does the work that preceded it. But the app no longer supplies a daily answer to the question of what to do next. Stern’s next answer involved several businesses, a trip and a considerable amount of starting over.
Several answers to “what next?”
In April 2026, he opened a newsletter called K Factor and described the intervening period. A two-month trip through Asia with Sarah helped set Golden Egg Media in motion. Snowbird, a home-services venture he started with former Official adviser Duncan, attracted clients but closed when its prospects for scaling looked unconvincing. He also invested in Tyler Moody’s study-abroad business FlexTrip and joined as a partner.
These projects shared people and accumulated experience more readily than an industry. The former adviser became a collaborator. Travel produced work. Marketing Official became an education in distribution. There was no tidy progression from one company title to the next, but there were relationships he could carry between them.
In May, he introduced Social Intelligence Labs, proposing tools to interpret the torrent of public behavior across social platforms. The question had moved from attracting attention to understanding it: why did something spread, what was gathering momentum, and what should a brand do with that information?
His work on Wave, a trend-intelligence platform, captures the product preference well. He wanted screens that helped users decide what to make next, rather than merely presenting rows of social data. The same impatience with scattered information that once produced saved maps was now being applied to a marketing dashboard.
A Nerf gun in the professional feed
His public persona supplies a useful corrective to the polished founder biography. On LinkedIn, Stern announced a commitment to “semi-cringe” posting, joking about the professional obligation to produce personal anecdotes. In another post, he defended posing with a Fortnite-branded Nerf gun. He understands the theatre of the feed well enough to put himself in the joke.
There are quieter interests too. He shares travel photography from Italy, Australia, India and Brazil. Asked what he would do if money were irrelevant, he answered: “Making Pizza.” The person who spent his early career assessing companies has left room for a more immediately testable product.
Back to the notes, on a larger scale
On October 1, 2026, Stern introduced mimi. He described a planned platform through which people could request their data from other services, bring it together and train an AI model around their own lives. His examples included purchases, travel, messages and calendars: separate records held by separate companies, each describing a different slice of a person.
It remains a venture he is building. His proposal includes selling insights derived from personal models rather than selling raw consumer data, with trust central to the arrangement. That distinction is part of the proposed business model, not evidence that every question about the product has already been settled. The promise will have to be demonstrated in the product itself.
The connection to Official is easy to see. Both begin with fragments: the things someone said, places worth saving, activities waiting to happen. Both ask whether software can make those details more useful to the person living through them. Years after a student started taking notes about a girlfriend, Stern is still trying to bring the scattered tabs together. The filing system has become considerably more ambitious.
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The conversation continues.