
15 segments available
GStack is an open-source toolkit built by YC President & CEO Garry Tan that turns Claude Code into an AI engineering team — with skills for office hours, design, code review, QA, and browser testing. Use it with Claude Code or Codex or Cursor. It's free and open source: https://github.com/garrytan/gstack In this video, Garry walks through how GStack works, starting with Office Hours, a skill modeled after real YC partner sessions that pressure-tests your idea before you write a line of code. He demos it live, going from idea through adversarial review, design mockups, and automated QA in a single session. 00:00 – AI Just Changed Coding Forever 00:09 – From YC to Building With AI 01:07 – Why AI Coding Feels So Different 02:45 – Turning AI Into a Real Team (GStack) 03:45 – Let’s Build an App Live 05:23 – The Question That Kills Most Ideas 07:13 – This Idea Just Got Way Bigger 08:38 – The “Feels Illegal” AI Hack 10:50 – Upgrading the Idea in Real Time 12:44 – Breaking + Fixing the Plan 14:25 – AI Designs the App 16:59 – The Full System Explained 18:00 – Running Multiple AI Engineers 20:00 – Shipping 10x Faster 21:20 – The Only Thing That Matters Now Apply to Y Combinator: https://www.ycombinator.com/apply Work at a startup: https://www.ycombinator.com/jobs https://www.conductor.build/
"Hi, I'm Garry, president and CEO of Y Combinator. I'm also an engineer who spent the first decade of my career building software full-time. I studied computer systems engineering at Stanford, then was..."
"video, I want to explain how it can help you build with agents. I've coded more in the past 2 months than I did in all of 2013, which is the last time I worked really, really hard as an engineer. I st..."
"your product before you start building. Let me show you how it works. The best way to get started with G stack is actually conductor. And so we're going to go in, quick start, and G stack is actually ..."
"and I'm trying to do a startup to create to help people get all their 1099 ints out of their Gmail and financial institutions. Many banks will email you with uh new tax documents, but some won't. So, ..."
"searches the web sometimes and figures out, well, what what are you trying to do? Here's the question that determines everything else. What's the strongest evidence that you have that someone actually..."
"of Office Hours. I might just build this for myself just for fun because I do have to do this every single year. And this actually one of the most fun parts about using Office Hours and G stack is it'..."
"the cloud. The cloud is just someone else's computer. One of the cool things that G-stack does increasingly is it lets you use Codex to actually sort out all of the crazy bugs that might be in here. I..."
"Simultaneous to that, it could also ask the user what other banks they have. Also, and this is what happens for me, if they already have a CPA, you can find out from the email. And if you're me, you p..."
"really pride myself on in office hours working with startups. I have a very strong opinion about how the world works and what might work and um it's just very interesting to see Opus 4.6 mirror that i..."
"seconds. It actually farms it out to uh OpenAI Codex, which um is able to use Image Gen. So all right, let's There's three versions, command center, friendly progress, and split view. Let's take a loo..."
"actually build when you click approve on the plan. And then, after it's done writing the code, you can run review, which does a staff-level, uh, bug-catching service that goes through, puts the work t..."
"time. These are parallel PRs with parallel branches and parallel different features that all can land more or less simultaneously. And one of the bottlenecks I ran into was that, you know, once the ag..."
"have one or two sessions active for each project just evaluating and bringing in all the open source fixes that I'm getting from the community. Uh and I evaluate it in waves. Um one of the things that..."
"before you ever meet us. Give it a try and let me know what you think. This is the most incredible time in history to build software. The barrier to building just collapsed. The only question left is ..."