Schedule

	Main Hall (3F) #rubykaigiA	Multi-purpose Hall (2F) #rubykaigiB	409 + 410 (4F) #rubykaigiC No Translator	International Conference Room (5F) #rubykaigiD
09:00 - 10:00	Registration
10:00 - 11:10	JA Keynote The Year of Concurrency Yukihiro "Matz" Matsumoto @yukihiro_matz
11:20 - 12:00	JA Ruby 3 Progress Report Matz & the Ruby Core Team @matzbot
12:00 - 13:30	Lunch 🍜
13:30 - 14:10	JA Performance Improvement of Ruby 2.7 JIT in Real World Takashi Kokubun @k0kubun	EN How to take over a Ruby gem Maciej Mensfeld @maciejmensfeld	EN Terminal Editors For Ruby Core Toolchain ITOYANAGI Sakura @aycabta	JA How to use OpenAPI3 for API developer ota42y @ota42y
14:20 - 15:00	EN Write a Ruby interpreter in Ruby for Ruby 3 Koichi Sasada @ko1	EN Determining Ruby Process Counts: Theory and Practice Nate Berkopec @nateberkopec	EN Pathfinder - Building a Container Platform in Ruby Ecosystem Giovanni Sakti @giosakti	JA Pragmatic Monadic Programing in Ruby joker1007 @joker1007
15:00 - 15:40	Afternoon Break
15:40 - 16:20	JA A Type-level Ruby Interpreter for Testing and Understanding Yusuke Endoh @mametter	EN Compiling Ruby to idiomatic code in static languages Alexander Ivanov @alehander42 Zahary Karadjov @zah	EN Writing Debuggers in Plain Ruby! Fact or fiction? Genadi Samokovarov @gsamokovarov	JA Ruby for NLP Yoh Osaki @youchan
16:30 - 17:10	EN Fibers Are the Right Solution Samuel Williams @ioquatix	EN A Bundle of Joy: Rewriting for Performance Matthew Draper @_matthewd	EN A Deep Learning Adventure Paolo Perrotta @nusco	JA RMagick, migrate to ImageMagick 7 Shizuo Fujita @watson1978
17:20 - 18:00	JA Pattern matching - New feature in Ruby 2.7 Kazuki Tsujimoto @k_tsj	EN Building Serverless Applications in Ruby with AWS Lambda Alex Wood @alexwwood	EN GraphQL Migration: A Proper Use Case for Metaprogramming? Shawnee Gao @gao_shawnee	JA Compacting GC for MRI v2 Aaron Patterson @tenderlove

	Main Hall (3F) #rubykaigiA	Multi-purpose Hall (2F) #rubykaigiB	409 + 410 (4F) #rubykaigiC No Translator	International Conference Room (5F) #rubykaigiD
08:30 - 10:00	Breakfast
10:00 - 11:10	JA Keynote All bugfixes are incompatibilities nagachika @nagachika
11:20 - 12:00	EN How RSpec works Sam Phippen @samphippen	EN Six Years of Ruby Performance: A History Noah Gibbs @codefolio	EN Practical mruby/c firmware development with CRuby Hitoshi HASUMI @hasumikin	JA Better CSV processing with Ruby 2.6 Kouhei Sutou @ktou Kazuma Furuhashi @284km
12:00 - 13:30	Lunch 🍜
13:30 - 14:10	JA intimate Chat with Matz and mruby developers about mruby Hiromasa Ishii @Hir0_IC	EN Zeitwerk: A new code loader Xavier Noria @fxn	EN Yabeda: Monitoring monogatari Andrey Novikov @Envek	JA Ovto: Frontend web framework for Rubyists Yutaka HARA @yhara
14:20 - 15:00	EN State of Sorbet: A Type Checker for Ruby Jake Zimmerman @jez Paul Tarjan @ptarjan	EN Actionable Code Coverage Michael Grosser @grosser	JA RubyData Workshop (14:20 - 15:30) Kenta Murata @mrkn Kazuma Furuhashi @284km Kozo Nishida @kozo2 Kouhei Sutou @ktou Kazuhiro NISHIYAMA @znz	JA Terminal curses Shugo Maeda @shugomaeda
15:00 - 15:40	Afternoon Break
15:40 - 16:20	EN A light weight JIT compiler project for CRuby Vladimir Makarov @vnmakarov	EN Building a game for the Nintendo Switch using Ruby Amir Rajan @amirrajan	EN Crystalball: predicting test failures Alex Rodionov @p0deje	EN The fastest way to bootstrap Ruby on Rails Uchio KONDO @udzura
16:30 - 17:10	EN Benchmarking your code, inside and out Emily Stolfo @estolfo	EN Beyond `puts`: TruffleRuby’s Modern Debugger Using Chrome Kevin Menard @nirvdrum	EN Building Homebrew in Ruby: The Good, Bad and Ugly Mike McQuaid @MikeMcQuaid	JA What is Domain Specific Language? Tanaka Akira @tanaka_akr
17:20 - 18:20	EN/JA Lightning Talks

	Main Hall (3F) #rubykaigiA	Multi-purpose Hall (2F) #rubykaigiB	409 + 410 (4F) #rubykaigiC No Translator	International Conference Room (5F) #rubykaigiD
08:30 - 10:00	Breakfast
10:00 - 11:10	JA Ruby Committers vs the World
11:20 - 12:00	JA (partially) Non-volatile mruby Yurie Yamane(team yamanekko) @yuri_at_earth Masayoshi Takahashi @takahashim	EN Fuzzing native Ruby code with Kisaten Ariel Zelivansky @zelivans	EN The Selfish Programmer Justin Searls @searls	JA Cleaning up a huge ruby application Sangyong Sim @riseshia
12:00 - 13:30	Lunch 🍜
13:30 - 14:10	JA The challenges behind Ruby type checking Soutaro Matsumoto @soutaro	EN JRuby: The Road to Ruby 2.6 and Rails 6 Charles Nutter @headius Thomas E Enebo @tom_enebo	EN Running Ruby On The Apple II Colin Fulton @PeterQuines	JA Best practices in web API client development Go Sueyoshi @sue445
14:20 - 15:00	JA The future of the Bundled Bundler with RubyGems Hiroshi SHIBATA @hsbt	EN Pre-evaluation in Ruby Kevin Deisz @kddeisz	JA dRuby 20th anniversary hands-on workshop (14:20 - 15:30) Masatoshi SEKI @m_seki	JA Performance Optimization Techniques of MessagePack-Ruby Sadayuki Furuhashi @frsyuki
15:00 - 15:40	Afternoon Break
15:40 - 16:20	JA Reducing ActiveRecord memory consumption using Apache Arrow Kenta Murata @mrkn	EN Ruby Serverless Framework Tung Nguyen @tongueroo	EN Play with local vars Tatsuhiro Ujihisa @ujm	JA Timezone API nobu @n0kada
16:30 - 17:10	JA The send-pop optimisation Urabe, Shyouhei @shyouhei	EN TruffleRuby: Wrapping up compatibility for C extensions Petr Chalupa @pitr_ch	EN Working towards Bundler 3 Colby Swandale @oceanicpanda	JA Red Chainer and Cumo: Practical Deep Learning in Ruby Naotoshi Seo @sonots Yusaku Hatanaka @hatappi
17:20 - 18:30	EN Keynote Optimization Techniques Used by the Benchmark Winners Jeremy Evans @jeremyevans0
18:30 - 18:45	Closing