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Shopify CEO Tobias Lütke used an AI-assisted autoresearch pattern with a coding agent to optimize the Liquid template engine, achieving 53% faster parse+render performance and 61% fewer allocations through 120 automated experiments across 93 commits. The effort demonstrates how robust test suites and AI agents enable effective performance optimization and enable high-level engineers to contribute meaningfully to code.

Shopify/liquid Tobias Lütke Andrej Karpathy Simon Willison Django Pi David Cortés
simonwillison.net · duck · 13 hours ago · details · hn