TLDR Tech / Practical
Fin Discusses Rails Monolith Performance and AI Agent at Rails World
Ryan Sherlock, engineering leader at Fin, spoke at Rails World 2026 about managing their 15-year-old Rails application under heavy load. Strategies include efficient test selection, dense CI workers, pre-compiled boot caching, and automatic rollbacks. The company also uses its AI agent, Shrek, which autonomously approves approximately 40% of code changes after thorough backtesting and adherence to safety protocols.
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