What's up?¶

Jason Liu here.

These days, I'm a Developer Experience Engineer on the Codex team at OpenAI.

Most of this site is about building AI systems, open source, consulting, and sometimes the more personal stuff. Some posts are about RAG, agents, evals, and product work. Others are about RSI, self-worth, ambition, and trying not to confuse productivity with being a person. That's on purpose.

Also: creator of Instructor, a Python library for structured LLM outputs that OpenAI cited as inspiration for their structured output feature.

If you want to keep up with new posts, follow on Twitter or subscribe to the newsletter.

Start Here¶

• Advice to Young People, The Lies I Tell Myself
• Losing My Hands
• Context Engineering Series
• Systematically Improving RAG

What This Site Is¶

I used to run consulting, expert calls, and cohort-based training around AI products. Those offerings are closed now.

This site is mostly where I put things I think are worth keeping:

• practical notes on building AI systems
• writing on work, taste, and personal growth
• talks, playbooks, and the occasional useful rabbit hole

Investments¶

I'm an angel investor and scout for Andreessen Horowitz. I've invested in companies like Lovable, Poke, Modal, Exa, Browserbase, Raindrop.ai, and Pydantic. See the full portfolio.

Old Work¶

Before shutting it down, I ran a solo consulting practice helping startups transition to AI, including Zapier, HubSpot, Weights & Biases, Modal Labs, Timescale, and Pydantic. If you're curious how I thought about indie consulting, the archive is here.

Training¶

I also ran cohort-based training on RAG, AI agents, and independent consulting. Students came from OpenAI, Anthropic, Google, Microsoft, Amazon, McKinsey, and others. The course content is now open at Systematically Improving RAG.