# Charlie Guo

> Charlie Guo is a Stanford and YC alum who turned a personal obsession with AI into a 23,000-subscriber newsletter and a Developer Experience role at OpenAI. Through Artificial Ignorance at ignorance.ai, he writes at the intersection of software engineering and artificial intelligence - cutting through hype to deliver practical, hands-on insights for builders. He has co-founded multiple startups (ClassOwl, FanHero, Crowdmade), published a book of startup interviews called Unscalable, and created a widely-used Python library for Gmail with 1.8k GitHub stars - all while teaching himself AI engineering through relentless experimentation.

- **Role:** Developer Experience Engineer at OpenAI
- **Organizations:** OpenAI, Artificial Ignorance
- **Nationality:** American
- **Education:** Computer Science, Stanford University
- **Known for:** Grew Artificial Ignorance newsletter to 23,000+ subscribers, Reached Substack bestseller status, Created charlierguo/gmail Python library with 1,800+ GitHub stars

## Career timeline

- **2013** — Created charlierguo/gmail - a Pythonic interface for Google Mail (now 1.8k GitHub stars)
- **2013-2015** — Co-founded ClassOwl, an edtech startup; co-designed architecture in Python/Django; partnered with Stanford and other schools
- **2015** — ClassOwl sold to Branch Metrics by co-founders
- **2015-2017** — Co-founded FanHero, a YC-backed startup
- **2017-2022** — Co-founded Crowdmade; served as CTO of an eCommerce company; continued building products and internal tools
- **2022** — Began experimenting with LLMs and AI engineering after ChatGPT's launch; built early AI projects publicly
- **2023** — Launched Artificial Ignorance newsletter on Substack at ignorance.ai
- **2023** — Joined Pulley as Staff AI Engineer
- **2024** — Grew Artificial Ignorance to 13,000+ free subscribers; reached Substack bestseller status
- **2025** — Newsletter crossed 23,000+ subscribers
- **2026-02** — Joined OpenAI as Developer Experience Engineer

## Achievements

- Grew Artificial Ignorance newsletter to 23,000+ subscribers
- Reached Substack bestseller status
- Created charlierguo/gmail Python library with 1,800+ GitHub stars
- Co-founded YC-backed startup FanHero
- Co-founded ClassOwl (acquired by Branch Metrics in 2015)
- Published Unscalable, a book of startup interviews and lessons
- Featured in Wired magazine
- Joined OpenAI as Developer Experience Engineer in 2026
- Arctic Code Vault Contributor on GitHub

## Latest updates

- **2026-02** — Joined OpenAI as Developer Experience Engineer, focused on docs, guides, tutorials, and examples for developers
- **2026-01** — Announced joining OpenAI in a newsletter post titled 'On Joining OpenAI'
- **2025-02** — Celebrated two years of Artificial Ignorance; newsletter at 23,000+ subscribers and Substack bestseller status
- **2025-01** — Deepened AI engineering content focus and explored sponsorship monetization for the newsletter

## Links

- Website: https://www.ignorance.ai/
- LinkedIn: https://www.linkedin.com/in/charlierguo/
- Twitter/X: https://x.com/charlierguo
- GitHub: https://github.com/charlierguo
- Facebook: https://www.facebook.com/charlierguo/

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Profile page: https://yespress.io/charlie-guo
Published by YesPress — https://yespress.io
Last updated: 2026-04-22