How This Ex-Meta L8 Engineer Ships 40 PRs a Day with AI Agents | Kun Chen

How This Ex-Meta L8 Engineer Ships 40 PRs a Day with AI Agents | Kun Chen

Author: Peter Yang June 7, 2026 Duration: 56:18

Kun is an ex-L8 principal engineer at Meta and Microsoft who now ships 40 PRs a day without manually reviewing code. In our episode, he walked through the free tools he built to make that possible: Lavish for visual planning in HTML artifacts, Treehouse for parallel agents, and No Mistakes for catching AI coding errors before they make it to production.


Kun and I talked about:

(00:00) Why he doesn't review code anymore

(01:04) Agentic engineering: Plan, code, validate

(06:22) Demo: Fixing an AI tutor screen with agents

(08:40) Demo: Why HTML is better than markdown for planning

(19:53) How to turn a rough idea into an AI-ready spec

(23:21) How Kun runs 20-30 agents in parallel

(32:04) No Mistakes: Kun's free AI code review tool

(45:19) What Kun checks before merging AI-written code

(50:18) How to get better at agentic engineering


Thanks to our sponsors:

Linear: The AI agent platform for modern teams https://linear.app/behind-the-craft

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📌 Get the takeaways: https://creatoreconomy.so/p/how-this-ex-meta-l8-engineer-ships-40-prs-a-day-with-ai-kun-chen


📌 Get my personal AI operating system with all my skills and prompts: https://www.behindthecraft.com/


Where to find Kun:

GitHub: https://github.com/kunchenguid

X: https://x.com/kunchenguid


Kun's free tools from the episode:

Lavish (HTML editor): https://github.com/kunchenguid/lavish-axi

Treehouse: https://github.com/kunchenguid/treehouse

No Mistakes (AI code review): https://github.com/kunchenguid/no-mistakes


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For anyone building the future, Behind the Craft is a conversation with Peter Yang that moves beyond theory and into the tangible details of creation. This podcast lives in the messy, rewarding space where ideas become real products. Each episode is built on candid interviews with experts who have been in the trenches, dissecting the pivotal decisions, the unexpected hurdles, and the hard-won lessons that rarely make it into a polished case study. You’ll hear the unvarnished stories behind the features and companies shaping our world, focusing on the practical frameworks and mental models that effective product leaders and creators rely on daily. It’s about understanding the craft from the inside out-the strategic shifts, the team dynamics, the user insights that truly move the needle. Tune in for a direct, no-fluff dialogue designed to accelerate your own journey, providing actionable guidance you can apply immediately to level up your own work. This is where the blueprint meets the build.
Author: Language: English Episodes: 100

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