Aaron Patterson - Rails World 2025 Closing Keynote - YouTube

In the #RailsWorld Closing Keynote, Aaron Patterson (Ruby core team member since 2009, Rails core since 2011, and Senior Staff Engineer at Shopify) talks about the work that Shopify’s Ruby & Rails Infrastructure team is tackling in Ruby core, including Ractors for better parallelism and a new method-based JIT compiler, ZJIT, and shares some pro tips for Rails developers on writing JIT-friendly code. .