YC Just Published the Playbook for Replacing Your Firm

Earlier this month, Y Combinator released an 11-minute Startup School video called “How to Build an AI-Native Services Company.” The speaker, YC visiting partner Charlie Warren, opens with a prediction: some of the biggest companies of the next decade won’t be software businesses at all. They’ll be services companies, insurance carriers and law firms “rebuilt from scratch with AI doing most of the work.”

If that sounds familiar, it should. In March, Sequoia put a trillion-dollar number on the same idea. Sequoia named the prize. YC is now handing the instructions to anyone who wants them.

The video deserves a close read from anyone running a professional services firm. Not because it’s hostile. Because it’s specific. Warren describes exactly which work the startups are being sent after. And, without meaning to, exactly which work they’re being told to leave alone.

Which of your services fit the target profile

Warren gives founders four traits to look for in a market.

Low trust. Not “untrustworthy.” He means work where “the work is already outsourced and the customer cares about the final product, not how they got there.” The founder is “displacing a vendor, not asking the customer to do something fundamentally different.” In his words: “You’re showing up where the budget already lives and doing the work.” The vendor in that sentence is you.

Low judgment at the task level. “If you can break the work into pieces and every piece needs a human exercising actual judgment, you can’t really scale.” The target is work that decomposes into automatable steps, with human judgment needed in only a few places.

A high intelligence threshold. The work has to be hard enough that it takes models plus humans to deliver an outcome the customer accepts. Easy work attracts easy competition.

Regulation as a moat. YC treats regulation as an advantage: higher expectations and legal accountability keep out casual entrants.

The markets he names: tax, audit, insurance, mortgages, parts of healthcare, parts of logistics. The first two are the bread and butter of most accounting firms.

Read the four traits as a diagnostic. Which of your engagements would your client describe this way: we send it out, it comes back, we review the result? Work judged on its output, where the client never sees the process and doesn’t want to. That work fits the profile.

The pricing lesson they’re getting on day one

The middle of the video is a commercial education, and it’s the same one most firms have spent a decade resisting. “You have to sell outcomes, not seats or tokens.” Price per unit, per return, per claim, per loan, or price on the outcome itself. Never cost-plus, which “caps your upside permanently.” Never undercut the incumbent, because cheap pricing makes the work look cheap. His summary: price on value.

He cites Panacea, a YC company selling FDA regulatory services, which prices on the completed study rather than hourly, “which is the norm in the industry.” The norm is the opening.

The economics behind it: Warren tells founders that traditional services firms top out around 30% margins, and that what he calls “AI operating leverage” can push an AI-native services company toward software margins, in markets he sizes at two to three times software.

Founders with no clients and no track record are being taught outcome pricing as a starting assumption, while it’s still a contested partner-meeting topic inside the firms they’re aiming at.

The ground founders are told to avoid

Trait two cuts the other way.

Warren warns founders off work where every step needs real human judgment, because it can’t scale. He repeats the caution later as a test of intellectual honesty: are you using humans because the work genuinely needs judgment, or because you’re papering over product gaps?

That warning is a map of the defensible ground. Diagnosis, structuring, the call on what the client should actually do, the conversation where a client trusts one specific person with a consequential decision: the playbook tells founders that work is a trap for them. It doesn’t scale, so they shouldn’t build there.

So the threat doesn’t land on your firm as a whole. It lands on specific revenue lines inside it: the ones a client sends out and checks when they come back. The judgment-heavy lines sit outside the kill zone, but only if they’re priced and sold as what they are. Judgment given away inside an hourly bundle, subsidized by the commodity work the startups are now funded to take, is defensible ground earning commodity rates.

The hardest line in the video

The closing section argues founders shouldn’t buy an existing services firm and modernize it. Warren’s reasoning: “You just can’t acquire product-market fit.” A legacy business carries legacy expectations on metrics, hiring, and performance, and bolting AI on top doesn’t change any of them.

He’s talking to founders about acquisitions. Heard from inside the firm, it’s a colder claim: the things that make a firm hard to transform by acquisition (its metrics, its hiring model, its performance expectations) don’t care who’s attempting the transformation. They resist the existing partners as much as any acquirer.

Take that seriously, because half of it is right. Adding AI on top of the current business changes nothing. That’s the efficiency trap: faster delivery of the same offerings, billed the same way, is invisible in the P&L.

The half that’s wrong is the assumption that AI is the only variable. The thing a legacy firm can change, and a founder acquiring one usually can’t, is what it sells. New offerings, scoped and priced on outcomes, built on judgment the firm already owns. That isn’t “adding AI on top.” It’s the decision Warren’s entire pricing section assumes someone gets to make from scratch. Incumbents get to make it too. Most haven’t.

The race runs in both directions

Warren says the best founders in this category need three things: domain fluency, model fluency, and operational rigor. On the first he’s blunt about the stakes: you’re selling to skeptical buyers in regulated markets, so you have to “bleed credibility.” Direct experience is best, he says, but “learned is actually okay.”

Underline that last phrase. Your firm holds the one asset his founders have to manufacture: decades of credibility with exactly those skeptical buyers. They hold what your firm has to learn: model fluency and a commercial design built for it. Two sides, racing toward the same combination from opposite ends.

Set Warren’s curriculum against the Three Shifts that separate professional services firms gaining margin from the ones losing it. Two of the three are about the work itself: pricing on outcomes instead of hours, and packaging offerings instead of building each one bespoke. His founders get taught both. The third shift is about the relationship, moving from reactive service a client calls for to proactive counsel a client leans on. The playbook never mentions it, because his founders don’t start with the client relationship that makes it possible.

The video’s only real blind spot is assuming the incumbents won’t run. The Big Four are already running. The open question is the mid-market.

Run your firm through their filter

Don’t argue with the video. Use it.

List your service lines. Mark the ones a client would describe as outsourced and judged on output, where the process is invisible and the deliverable just gets checked. Those fit YC’s profile. Expect margin pressure on them, and decide now whether to reprice them, productize them, or shrink your dependence on them.

Then mark the lines where every engagement turns on judgment a client trusts you specifically to exercise. YC just told its founders to stay away from that work. It’s yours to keep, on one condition: that it’s named, scoped, and priced as the offering it is, instead of riding along unbilled with the work that’s now in play.

The map is public. It’s a good map. Nothing about it says incumbents can’t use it.