Episode 116

Takashi Kokubun on ZJIT, Ruby Performance, and the Path from Japan to Shopify

With Takashi Kokubun,
April 6, 2026

What we talked about

Takashi Kokubun is a Staff Developer on the Ruby JIT team at Shopify, where he works on ZJIT, the next-generation Just-In-Time compiler for Ruby that shipped with Ruby 4.0. Before going deep on compilers full time, he worked on distributed systems and infrastructure, and along the way earned a Master of Science in Computer Science from Georgia Tech while working full time in the United States.

Show notes

Takashi, welcome to the show. 

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