RubyKaigi 2025

Matsuyama, Ehime, Japan • April 16-18, 2025

rubykaigi.org/2025

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RubyKaigi is a yearly conference and features 70 talks from various speakers, including keynotes by Mari Imaizumi, Ivo Anjo, and Yukihiro "Matz" Matsumoto.

Overview Talks Speakers Schedule Sponsors CFP

70

Talks

74

Speakers

102

Sponsors

Keynotes

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talk by Mari Imaizumi: Keynote: Ruby Taught Me About Encoding Under the Hood

Keynote: Ruby Taught Me About Encoding Under the Hood

Mari Imaizumi

RubyKaigi 2025

talk by Ivo Anjo: Keynote: Performance Bugs and Low-level Ruby Observability APIs

Keynote: Performance Bugs and Low-level Ruby Observability APIs

Ivo Anjo

RubyKaigi 2025

talk by Yukihiro "Matz" Matsumoto: Keynote: Programming Language for AI age

Keynote: Programming Language for AI age

Yukihiro "Matz" Matsumoto

RubyKaigi 2025

Talks

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talk by Takashi Kokubun: Deoptimization: How YJIT Speeds Up Ruby by Slowing Down

Deoptimization: How YJIT Speeds Up Ruby by Slowing Down

Takashi Kokubun

RubyKaigi 2025

talk by Takeshi KOMIYA: Introducing Type Guard to Steep

Introducing Type Guard to Steep

Takeshi KOMIYA

RubyKaigi 2025

talk by David T. Crosby: A side gig for RuboCop, the Bookworm code crawler

A side gig for RuboCop, the Bookworm code crawler

David T. Crosby

RubyKaigi 2025

talk by Mari Imaizumi: Keynote: Ruby Taught Me About Encoding Under the Hood

Keynote: Ruby Taught Me About Encoding Under the Hood

Mari Imaizumi

RubyKaigi 2025

talk by Masayuki Mizuno: Continuation is to be continued

Continuation is to be continued

Masayuki Mizuno

RubyKaigi 2025

talk by Maciej Mensfeld: Bringing Linux pidfd to Ruby

Bringing Linux pidfd to Ruby

Maciej Mensfeld

RubyKaigi 2025

talk by Hiroya FUJINAMI: Make Parsers Compatible Using Automata Learning

Make Parsers Compatible Using Automata Learning

Hiroya FUJINAMI

RubyKaigi 2025

talk by Yuta Saito: The Evolution of the CRuby Build System

The Evolution of the CRuby Build System

Yuta Saito

RubyKaigi 2025

Speakers

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Ivo Anjo

Cristian Planas

Marco Roth

Stephen Margheim

Chris Hasinski

Mari Imaizumi

Uchio KONDO

Yukihiro "Matz" Matsumoto

Sponsors

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dely inc.

ASHITA-TEAM Co., Ltd.

WED, Inc.

codeTakt Inc.

ESM, Inc.

Drinkup Sponsor

mybest, Inc.

Qiita Inc.

Drinkup Sponsor

primeNumber Inc.

HireRoo, Inc.

CrowdWorks, Inc.

Ruby Development Inc.

Karrot

ZOZO, Inc.

FUNDINNO Inc.

Shopify

Ruby Committers' Sponsor

Findy Inc.

i-plug Co., Ltd.

DeNA Co., Ltd.

B4A, Inc.

GMO Flatt Security Inc.

ClearCode Inc.

A's Child

with.inc

Wantedly, Inc.

DIGGLE Inc.

PKSHA Technology Inc.

I'LL inc.

Ezowin Inc.

Being

Hubble Inc.

RAKSUL Inc.

SmartBank, Inc.

Hack Space Sponsor

xalpha Inc.

JetBrains

Rentio Inc.

mov inc.

Drinkup Sponsor

MEDLEY, Inc.

KOMOJU

GMO INTERNET GROUP

mruby/c

STMN.INC

PIXTA Inc.

Hamee Corp.

Network Applied Communication Laboratory Ltd.

freee K.K.

Drinkup Sponsor

FASTLY K.K.

Timee, Inc.

Cookpad Inc.

kickflow, Inc.

Net Protections, Inc.

Everyleaf Corporation

AppBrew, Inc.

MIXI, Inc.

IBJ, inc

Coincheck, Inc.

giftee Inc.

Drinkup Sponsor

TwoGate

Bloomo Securities Inc.

FjordBootCamp

vivid garden Inc.

Treasure Data

Drinkup Sponsor

TakeyuWeb Inc.

STORES, Inc.

Nursery Sponsor

ANDPAD Inc.

Social PLUS Inc.

Synchro Food

Leaner Technologies Inc.

Drinkup Sponsor

Unifa Inc.

Vonage

TimeTree, Inc.

GMO Pepabo, Inc.

Agileware

Drinkup Sponsor

pixiv Inc

Music Event and Scholarship Sponsor

ITANDI, Inc.

Offers

Doctorbook Inc.

SmartHR, Inc.

Scheduler and Drinkup Sponsor

Linc'well Inc.

Sentry

OPTiM Corporation

IVRy Inc.

Climbing Sponsor

MNTSQ, Ltd.

Tabelog

Linkers Corporation

SAKURA internet Inc.

Studyplus, Inc.

note inc.

Geekneer, Inc.

hacomono Inc.

Wellness and Drinkup Sponsor

esa LLC

i Cubed Systems, Inc.

Money Forward, Inc.

Research and Innovation Co.,Ltd.

Luxiar Co., Ltd.

Studist Corporation

SMS Co., Ltd.

RECEPTIONIST

ENECHANGE Ltd.

Tsukulink Inc.

TenshokuDRAFT

Fusic Co., Ltd.

TOKIUM Inc.