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Funding startups since 2005
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Recent posts
AI's biggest bottlenecks are moving beyond the models.
We're excited about a new wave of startups building the hardware, infrastructure, financial systems, and specialized software needed to bring intelligence into the real economy, from factories and data centers to government and space.
ycombinator.com/rfs
27 Oct 2026
đź“™The Pocket Guide of Essential YC Advice
Looking for more content on how to start and build a successful startup? Explore all of our free resources for founders:
đź“š Startup Library: ycombinator.com/library
▶️ Youtube: youtube.com/ycombinator
đź‘Ą Co-founder Matching: ycombinator.com/cofounder-matching
12 Apr 2023
Introducing Early Decision.
For students who want to do a startup but also want to finish school first. Apply now, get funded the moment you’re accepted, and do YC after you graduate.
ycombinator.com/early-decision
24 Sep 2025
With Theranos and Elizabeth Holmes back in the conversation, we’re revisiting one of the most remarkable firsthand accounts of what actually happened inside the company.
Tyler Shultz joined Theranos fresh out of Stanford as a true believer in its mission. His grandfather, former Secretary of State George Shultz, sat on the company’s board, and Elizabeth Holmes had become a mentor and even a presence at family gatherings. But once Tyler began working directly with Theranos’s technology, he discovered that the reality inside the lab looked very different from what the company was telling the world.
On The Social Radars, Tyler sat down with Jessica Livingston and Carolynn Levy to tell the full story of how he went from employee to whistleblower: the failed blood tests and red flags he uncovered, the culture of fear that kept employees silent, his attempts to raise concerns internally and with regulators, and the extraordinary legal pressure he faced after speaking to The Wall Street Journal.
This episode was originally recorded on December 4, 2024.
▶️ Tune in on our YouTube or at the link in bio!
11 Nov 2026
Replit was building toward the AI coding era years before it had a name.
In 2024, the company shipped an agent that could take a request in plain English, work through errors, provision its own infrastructure, and keep going until the software actually worked. The model companies even reached out to ask how Replit had pulled it off.
Co-founder and CEO Amjad Masad had been thinking about making programming radically more accessible since 2008, and Replit’s original pitch deck predicted AI-generated code before the Transformer paper was published. Today, that same technology is moving into banks, manufacturers, and other large companies, where Amjad says teams are replacing software projects once scoped at $10 million with $250,000 of Replit.
On How to Build the Future, Paul Graham sits down with Amjad to talk about why was so well positioned when coding agents arrived, what comes after vibe coding, and his bigger vision for the “self-driving company,” where AI agents increasingly build and operate the software a company needs.
▶️ Tune in on our YouTube or at the link in bio!
10 Nov 2026
When Rolls-Royce pulled out as Boom’s engine partner, it looked like a potentially fatal setback. Instead, it pushed Boom to build its own engine, a decision that ultimately helped unlock boomless supersonic flight and opened up an entirely new business: gas turbines for the massive power demands of AI data centers.
Boom founder and CEO Blake Scholl returns to The Social Radars with Jessica Livingston and Carolynn Levy to tell the story of how that crisis became one of the company’s biggest opportunities.
They talk about why building the engine in-house changed the airplane itself, how Boom realized the same technology could generate power for data centers, and why the new turbine business could help fund the development of its supersonic airliner.
▶️ Tune in on our YouTube or at the link in bio!
06 Nov 2026
Blacksmith (YC W24) is building a faster cloud for continuous integration (CI), helping developers test and ship code as AI coding tools generate more of it.
As software production accelerates, testing and validation are becoming the new bottleneck. That shift has helped Blacksmith grow 20x over the last year, and the company recently raised a $66 million Series C at a $1 billion valuation.
The founders started as outsiders to DevOps and built their first infrastructure using the same high-performance CPUs found in gaming PCs, renting servers originally designed for Minecraft and Call of Duty. Today, they run a much larger fleet with a team of just 30 people, helping companies cut CI waits from minutes to seconds.
In this first episode of Built to a Billion, they share how they found the idea, won their first 200 customers, and why faster testing will become even more important as agents write more of the world’s code.
▶️ Tune in on our YouTube or at the link in bio!
04 Nov 2026
Google, Anthropic, and Databricks were all started by founders with PhDs. But they’re exceptions to the rule. Many of the instincts that help researchers succeed in academia can often work against them when building a startup.
YC Visiting Partner Francois Chaubard knows both worlds. He’s currently a PhD student, previously did research in Fei-Fei Li’s lab, and founded and ran Focal Systems (W16).
In this episode of Startup School, Francois breaks down 10 mindset shifts researchers need to make to become formidable founders, from learning to thrive without grades or deadlines to distinguishing interesting problems from important ones, moving faster with imperfect information, and starting with what customers actually want.
▶️ Tune in on our YouTube or at the link in bio.
04 Nov 2026
Garry Tan reveals why @ycombinator decides in just 10 minutes whether or not to back a founder:
“10 minutes is a wonderful constraint,” CEO @GarryTan tells @Walter_Isaacson on today’s episode of The Builders.
“Paul Graham, the founder of YC, figured out that you didn’t need half an hour, you don’t need an hour, you could probably actually do it in about five minutes. But five minutes feels rude, so that’s how YC ended up at 10 minutes.
If you can say something very simply that hits us, like, you know, here’s a user, here’s a real person who has a problem, and here’s how the technology that we built actually solves that.
We just wanna know what it is and why it’s awesome, and then if we have a little bit of extra time, we wanna know why that founder is the person to go and build that thing.”
Watch the full episode at the link in our bio.
03 Nov 2026
Consider this a sign.
ycombinator.com/apply
01 Nov 2026
A lot of what makes a great engineer also makes a great founder.
Before starting Layers Bio and BootLoop, Shivani Patel and Christopher Markus worked at SpaceX, where they learned to take ideas from zero to one, solve hard problems, and own the outcome.
You don’t need to have everything figured out before you start. You just need the conviction to go build.
If you’re making something people want, we’d love to hear from you.
Apply to YC W27 by Nov 2: ycombinator.com/apply
01 Nov 2026
Some of the most valuable data in the world can never leave the building. Defense contractors, banks, hospitals, and nuclear plants can’t simply send it to a cloud AI API.
That creates an opportunity to bring frontier AI inside those walls: on-prem models, deployment tooling, security accreditation, and hardware for the parts of the economy the cloud can’t reach.
ycombinator.com/apply
31 Oct 2026
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