He left a seat at Lazard to cold-call strangers until one of them said the four words every founder waits for: this makes sense. That call became Bolto.
Mern Singh runs Bolto from San Francisco, and the pitch fits on a napkin: find the engineer, vet the engineer, pay the engineer, keep the paperwork legal in whatever country the engineer happens to live in. One platform. The AI does the sorting. The human does the deciding. He calls it the first proactive HR stack, which is a polite way of saying most HR software waits for you to file a ticket while Bolto tries to solve the problem before you notice it exists.
Bolto sources talent from big tech and top startups, runs a five-stage vetting gauntlet - resume screen, technical interview, AI behavioral assessment, professionalism training, human review - and then hands companies access to one of the largest pools of pre-vetted software engineers anywhere. Recruiting on one side, payroll across 150+ countries on the other, global compliance stitched through the middle. The unglamorous machinery of employing people, rebuilt so a fourteen-person team can run it instead of a department.
He was christened Mrinal. The internet, his investors, and most of his inbox know him as Mern. Both names point at the same person, and that person spent the back half of his early twenties doing something most people only threaten to do over drinks: he quit the safe job.
Here is the part founders rarely put on a slide. Bolto got into Y Combinator's Summer 2023 batch, walked in proud of its idea, and was promptly told to pivot. The new direction failed inside two weeks. Singh and his co-founders - Jake Johnson, a former Microsoft PM and Dartmouth engineer, and Milan Bhandari - had walked away from high-paying jobs with little startup experience between them, and now stood in the most prestigious accelerator in the world holding an idea that didn't work.
Their fix was not a clever growth hack. It was a telephone. They picked up the phone and started calling people, again and again, hunting for a problem real enough to justify a company. The breakthrough arrived when they pitched YC partner Dalton Caldwell and got, for the first time, a yes worth keeping: “This makes sense.” His advice to founders is the lesson worn smooth by that fortnight - put down the deck, pick up the phone, and keep dialing until the market tells you what it actually wants.
Singh has a conviction that reads like a provocation: there will never be a manager at Bolto. Not a slogan about being scrappy - a structural bet. He borrows the idea from Palantir and calls the role a Lead. A Lead is accountable for outcomes, sets the pace, drops into the weeds when the work demands it, and earns influence by executing rather than by sitting one rung up the org chart. Management, in his telling, is a means to an end that too many companies mistake for the end itself.
It is the kind of statement that gets argued about in the comments, which is rather the point. When you sell a product that promises to flatten the busywork of running a team, an opinionated theory of how teams should run is not a distraction. It is the brochure.
In March 2025, Bolto announced a $5.1M seed round backed by Y Combinator, General Catalyst, and others. The forty-eight hours after the announcement gave Singh a small thrill worth quoting back: 180,000+ impressions across social, 42 new demos booked, 179 companies signed up for the platform. The team had spent three months preparing for that launch. The number that mattered was not the dollars raised but the strangers who showed up unbidden to try the thing.
A year later, in April 2026, came the $12M Series A, with the same mission scaled up: the first AI-native, all-in-one recruiting, payroll, and HR system. Total funding now sits near $12.1M. The headcount is still small enough to fit around a long table, which is exactly the kind of company that should be building software to make small teams feel large.
The road in was conventional right up until it wasn't. Indian Hill High School, class of 2017, in the suburbs of Cincinnati - the school later flagged him as an alumni highlight, the local kid who went and built an AI company. Then Dartmouth College, an AB, and a landing spot at Lazard, where from 2021 he did the investment-banking apprenticeship that mints careers in finance. He left it in 2023. The spreadsheets were replaced by a phone and a list of strangers to call, which is either a downgrade or the best trade he ever made, depending on which quarter you ask.
What makes Singh worth watching is not that he raised money or got into YC - plenty do both and vanish. It is the specific shape of his bet. He is selling automation to companies while insisting his own company stay deliberately human in structure, no managers, just Leads who do the work. He is building the largest vetted engineer pool on earth from a founding story that began with cold calls. The contradictions are the brand, and so far the market keeps saying the same four words back to him.
Strip away the funding theatre and Bolto is a sorting problem. The world is full of software engineers; the hard part is knowing which ones are good before you wire them money in a currency you've never handled. Bolto's answer is a five-stage filter that candidates pass through before a customer ever sees them: a resume screen, a technical interview, an AI behavioral assessment, professionalism training, and a final human review. Typical candidates come from places like the IITs and their global equivalents, people who have already done time at reputable firms. The promise to the buyer is simple - the long tail of bad hires gets cut before it reaches your inbox.
Then the boring half of employment, which is where most platforms quietly give up. Onboarding. Document management. Localized compliance that changes line by line depending on whether your new hire sits in Lagos, Lisbon, or Lima. Payroll that clears in 150+ countries without a finance team building spreadsheets at midnight. Singh's framing is that this is the part AI should eat first, because it is rules-heavy, error-prone, and nobody wakes up wanting to do it. The pitch is not that Bolto makes hiring exciting. It is that Bolto makes the unexciting parts disappear.
There is a tidy symmetry to the whole enterprise. A founder who left finance to chase a real problem now sells software that helps other companies skip the slow, expensive parts of building a team. A man who insists on no managers is building the tooling that lets teams stay flat as they scale. Bolto's own customer list - companies like Fiber AI, Mercoa, Fountain, and Pareto - reads like the cohort of startups that would rather not hire an HR department at all. Singh is selling to people who think like he does, which is usually the safest market a founder can pick.
He is early. The headcount is small, the category is crowded with incumbents who move slowly, and the AI-native pitch still has to prove it survives contact with payroll regulators in a hundred jurisdictions. But the through-line from a cold call in 2023 to a $12M Series A in 2026 is not luck dressed up as strategy. It is a founder who learned, in two brutal weeks at YC, that the only thing that matters is whether a real person on the other end of a phone says the work makes sense. He keeps building until they do.
In His Own WordsThere will never be a manager at Bolto.
We picked up the phone and started calling people until we found a real problem worth solving.
Managers manage. Leads execute. We're betting on the latter.
The hardest day at Bolto was right after we joined YC.