For a decade (2014-2024), I was a Ruby-only developer. I worked across the Ruby ecosystem—from Rails development to Ruby’s core tooling like IRB, RDoc, and the debug gem. But while I moved around the stack, I stayed within Ruby’s boundaries. Ruby wasn’t just my primary language; it was essentially my only language. That changed in 2025. This year, I’ve contributed to Sorbet (C++), worked on RBS’s parser (C), and am now diving into ZJIT (Rust). A combination of factors enabled this shift—somethin...