How AI Coding Agents Will Change Your Job

TL;DR

AI coding agents have improved dramatically in recent months, enabling a non-professional (the speaker) to build a 35,000-line interactive voice agent without writing any code. YC founders are rapidly adopting these tools—about a third to half of current batch companies primarily write code this way, up from 25% last batch and ~0% two batches ago.

Key insights

• The speaker went from zero code tools (Lovable, Replit) to Cursor, Windsurf, and Claude Code, rebuilding his blog in 90 minutes on a train and later building a serious 35,000-line app without writing
• After the first 5,000 lines, he stopped reading the code entirely—just prompted, auto-accepted, and came back to new features.
• Two batches ago, ~0% of YC companies used AI for most of their code; last batch it was 25%; this batch it's a third to a half.