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PostHog's engineer used multiple long-running Claude Code sessions to rewrite their SQL parser, achieving a 70x speedup over the previous ANTLR-based parser, while barely looking at the code themselves.
PostHog used an AI agent based on Karpathy's autoresearch to find a three-year-old bug in their ClickHouse query engine that prevented proper primary key usage for timestamp filters. Fixing it improved performance by 11% and reduced scanned granules by 62%.
BossHogg is an agent-first command-line interface (CLI) tool designed for managing PostHog analytics and feature flags.