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Developer Peter Steinberger Runs 300k-Line Codebase Solo Using AI Agents

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Peter Steinberger, a solo developer, maintains a 300,000-line TypeScript and React ecosystem — spanning a web app, Chrome extension, CLI tool, desktop client, and mobile app — entirely with the help of AI agents. He presented his workflow at a London event in June, outlining a method built around running 3–8 parallel Codex instances with short, often one-to-two sentence prompts. His approach favors practical habits such as using tmux for persistent CLI sessions, sharing screenshots for UI context, writing tests within the same session as features, and avoiding full context resets in favour of structured handovers. Steinberger also recommends keeping custom prompts minimal, preferring medium over high reasoning to conserve tokens, and scheduling regular refactor time using tools like jscpd and oxlint. His philosophy centres on reducing overhead and shipping consistently, positioning him as a grounded voice in the growing field of agentic software development.

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