Jake Cronin

Jake Cronin runs Siro from an office on West 23rd Street in Manhattan, but the product he sells was born on front porches. Siro records the face-to-face conversations that field sales reps have all day - the pitch at a homeowner's door, the walkthrough in a driveway, the close at a kitchen table - and turns them into coaching. Where most sales software watches what happens inside a CRM, Cronin built a company around the part of selling that no dashboard ever captured: the human conversation itself.

That focus is deliberate. Cronin's argument, repeated in interviews and investor letters, is that the field rep has been the most under-served person in the entire sales stack. Companies spent a decade building tools to enrich contact data and log deals. Almost nobody built for the person standing on the doorstep. Siro is his correction.

The platform transcribes those conversations and runs them through both general and industry-specific models - an HVAC model that knows the rhythm of a home-services pitch, for instance - to grade things like rapport-building and how a rep handles rejection. Managers get a dashboard where a great call can be shared across a team. Reps get feedback the same day. According to the company, roughly 80% of reps who have access choose to receive AI coaching daily, and teams using it have reported meaningfully higher close rates and lower turnover.

From a summer job to a thesis

The origin story is unusually literal. As a college student, Cronin had a choice between a summer at an amusement park and selling Cutco kitchen knives door to door. He picked the knives. He turned out to be very good at it, ranking in the top 1% of Cutco sellers and, by his own telling, earning more at 18 than he later would as a McKinsey analyst.

The following year he opened his own office and hired other reps to sell. That is where the idea that became Siro first appeared - not as a technology, but as a frustration. He could coach reps when he stood next to them. He could not be next to all of them at once. The best coaching moments happened in the field, unrecorded and unseen, and then evaporated.

The detour through consulting

Before he built anything, Cronin took a more conventional path. He studied Math and Computer Science at Emory University, with a side focus on Chinese Studies that took him to Fudan University in Shanghai. He spent a stint in a neuromechanics lab, worked a market advisory role at BlackRock, and in 2018 joined McKinsey & Company as a business analyst, working on strategy and digital projects across software, utilities, oil and gas, and manufacturing. He won the firm's internal data hackathon along the way.

The consulting job gave him the analytical training and the outside view of how large sales organizations actually operate. It did not give him the thing he wanted to build. In late 2020 he left McKinsey and started Siro - and rather than hire a team first, he wrote the core product himself, pairing his sales instinct with the engineering he had studied.

Building the company

Siro grew from that solo codebase into a venture-backed company. By 2025 it had raised a $50 million Series B led by SignalFire, bringing its total funding to roughly $75 million, with participation from firms including Index Ventures, CRV and Fika, plus a roster of operators - among them 01 Advisors partners Dick Costolo and Adam Bain, Square's Saumil Mehta, and the founders of Squire. The company now works with sales teams across home services, telecom, dealerships, home improvement and multifamily, and says it has processed tens of millions of sales interactions from thousands of companies.

What Cronin describes wanting to build next is less a single feature than a connective layer. Siro, in his framing, captures the most important conversations in a business and connects the dots across them - across reps, across regions, across the whole organization - so that what one great rep does instinctively can be seen, taught, and repeated. It is the coaching office he ran as a teenager, scaled to a workforce he will never personally stand beside.

He is careful, in public, not to oversell what the technology replaces. The pitch is not that AI closes the deal. It is that the person at the door gets a little better every day, because for the first time someone - something - is paying attention to the conversation they just had.