Y Combinator CEO Gary Tan has returned to coding after a 13-year hiatus, leveraging modern AI tools to achieve a self-reported 400x productivity increase, shipping hundreds of thousands of lines of code for open-source projects.
Tan rebuilt his first startup, Posterous, in just five days for $200, a task that originally took a team, years, and millions of dollars, demonstrating the dramatic reduction in cost and time for software development.
He advocates for a development philosophy called "thin harness, fat skills," which involves using minimal, deterministic code to call LLMs, while defining complex, nuanced agentic behavior in detailed natural language prompts (Markdown).
Tan's return to building was motivated by his political activism in San Francisco, where he created a civic tech platform to research and write about local issues like public education, using AI agents to perform investigative journalism.
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Concerns Raised
Current AI development tools are powerful but brittle, like a 'Ferrari that will break down on the side of the road,' requiring deep technical expertise to fix.
Society faces a critical choice between user-controlled personal AIs and corporate-controlled AIs that may not align with individual interests.
Opportunities Identified
Massive (400x) productivity gains for individual software developers and small teams.
The ability to build and automate complex knowledge work, such as investigative journalism and QA testing, at a fraction of the traditional cost and time.
The potential for every person on the planet to have their own personal AI within a year.