Ryosuke Matsumoto
日本語
Portrait of Ryosuke Matsumoto

Ryosuke Matsumoto

松本 亮介まつもとりーmatsumotory

  • Representative Director and CTO, Normantics
  • Chief Researcher, SAKURA internet Research Center
  • Doctor of Informatics, Kyoto University

I have been researching the technologies that support the infrastructure of the internet. Today, while running the research organization at SAKURA internet Research Center, I try out ways of developing together with AI almost every day.

View all worksView career

The numbers and charts on this page are updated regularly. Last updated Nov 12, 2026.

Current work

As of Nov 2026

With informatics and AI, I aim to make increasingly complex norms something each person can handle.

Career timeline

Apr 2008 to Nov 2026

  1. – Present(3 mo)

    Current

    Normantics

    Representative Director and CTO

    Appointed Representative Director in September 2026, I oversee technology and business strategy and develop data and tools for AI to support work and everyday life.

  2. – Present(8 yr 1 mo)

    Current

    SAKURA internet Inc.

    Chief Researcher, SAKURA internet Research Center

    After joining as Senior Researcher, I became Chief Researcher in April 2022 and now shape research direction and evaluation.

Previously

  1. – (3 yr 7 mo)

    GMO Pepabo, Inc.

    Chief Engineer; Chief Researcher, Pepabo R&D Institute

    I researched web service infrastructure and proposed FastContainer, an architecture that adapts to changes in its execution environment.

  2. – (3 yr)

    Kyoto University · Graduate School of Informatics

    Doctoral student, Okabe Laboratory

    I researched web server control and extensibility, releasing results as open source software including mod_mruby.

  3. – (6 mo)

    Kyoto University · Academic Center for Computing and Media Studies

    Research student, Okabe Laboratory

    I presented research on web hosting security and operations, and obtained eligibility to apply for the doctoral program.

  4. – (3 yr 5 mo)

    Firstserver, Inc.

    Development and Operations Department

    I developed and operated hosting services, gaining practical experience in internet infrastructure.

Open the charts of works and activity per yearClose the charts of works and activity per year

Works per year

2011 to 2026

Papers, talks, articles, and awards, counted by year.

See the breakdown of works

Activity on GitHub per year

2011 to Nov 12, 2026

Contributions as counted by GitHub, shown by year.

See the breakdown of activity on GitHub

View as table
YearWorks per yearActivity on GitHub per yearMain affiliation in the year
2026, through Nov7215,998Representative Director, Normantics, Chief Researcher, SAKURA internet Research Center
202535Chief Researcher, SAKURA internet Research Center
2024121Chief Researcher, SAKURA internet Research Center
2023576Chief Researcher, SAKURA internet Research Center
20221045Chief Researcher, SAKURA internet Research Center
20212568Chief Researcher, SAKURA internet Research Center
202028494Chief Researcher, SAKURA internet Research Center
201957410Chief Researcher, SAKURA internet Research Center
2018361,022Chief Researcher, SAKURA internet Research Center, Chief Engineer, GMO Pepabo, Inc., and Chief Researcher, Pepabo R&D Institute
2017331,037Chief Engineer, GMO Pepabo, Inc., and Chief Researcher, Pepabo R&D Institute
2016301,270Chief Engineer, GMO Pepabo, Inc., and Chief Researcher, Pepabo R&D Institute
2015142,232Chief Engineer, GMO Pepabo, Inc., and Chief Researcher, Pepabo R&D Institute, Doctoral program, Okabe Laboratory, Graduate School of Informatics, Kyoto University
2014162,640Doctoral program, Okabe Laboratory, Graduate School of Informatics, Kyoto University
2013171,638Doctoral program, Okabe Laboratory, Graduate School of Informatics, Kyoto University
20123854Doctoral program, Okabe Laboratory, Graduate School of Informatics, Kyoto University, Research student, Okabe Laboratory, Academic Center for Computing and Media Studies, Kyoto University
2011155Research student, Okabe Laboratory, Academic Center for Computing and Media Studies, Kyoto University, Firstserver, Inc.
2010Not countedNot countedFirstserver, Inc.
2009Not countedNot countedFirstserver, Inc.
2008Not countedNot countedFirstserver, Inc.

Frequent words in work titles

  • Web servers37
  • Research and development29
  • Containers27
  • mruby26
  • Hosting24
  • Security23
  • Homeostasis and autonomous control22
  • Multitenancy20

Each number counts the works from 2011 to 2025 whose title contains the word or a related word.

  • Papers

    2011 to 2023

    73

    Doctoral thesis, journal papers, and papers at conferences in Japan and abroad. Includes co-authored papers.

  • Talks

    2013 to 2025

    140

    Counts the talks given in Japan and abroad. Includes moderating sessions and speaking in panel discussions.

  • Awards and honors

    2013 to 2020

    19

    Includes candidacies, final nominations, and recommendations. Also includes awards given to co-authored papers.

  • Articles published on my site

    Jul 2026 to Nov 2026

    72

    Articles on The Future of Humans, AI, and the Web, a site I run personally. Counts the articles in Japanese.

  • Merged pull requests

    Jan 2026 to Nov 2026

    4,165

    Counts the pull requests I opened on GitHub that were merged. 3,740 of them are in private repositories.

  • Activity on GitHub

    Jan 2026 to Nov 2026

    15,998

    Includes 11,259 commits and 4,555 pull requests. Issues, reviews, and other kinds of activity are also counted.

Activity on GitHub

Mar 2011 to Nov 12, 2026

Development activity on the account created in Mar 2011.

Contributions per day

Jan 1, 2026 to Nov 12, 2026

Commits, pull requests, and other activity as counted by GitHub, across public and private repositories.

  • 0
  • 1 to 8
  • 9 to 34
  • 35 to 80
  • 81 or more
  • Days yet to come
Total
15,998
Active days
269days
Longest streak
134days
Busiest day
644Oct 19, 2026
View as table
First day of weekSunMonTueWedThuFriSatWeek totalCommitsPull requestsIssuesReviewsRepositories createdOther
Nov 8, 202618148149128114543471040030
Nov 1, 20261862041571551032038285672580201
Oct 25, 20260002475351834391,4041,1092950000
Oct 18, 2026100644124368360101,0578002542010
Oct 11, 20261771201131284761366825121700000
Oct 4, 202623948291215240421337831000
Sep 27, 202612314114820251502109256462770020
Sep 20, 202630779649126270171990000
Sep 13, 20264861065526301131817312322000
Sep 6, 202624712241774230148784000
Aug 30, 2026411516326257156073552427210
Aug 23, 202622156911005143251821421000
Aug 16, 2026161139652601383582461110010
Aug 9, 2026717354782267221178400030
Aug 2, 202669789441661043982751230000
Jul 26, 202648175198243835752537413811020
Jul 19, 20261221545894103665073661383000
Jul 12, 2026902052825391101789006862131000
Jul 5, 202612787164127854283031240010
Jun 28, 20268010776383795817396081256000
Jun 21, 202611771933316153402316840020
Jun 14, 2026353152203179152631331290010
Jun 7, 202638231292189344490000
May 31, 20262365565068127314202331870000
May 24, 2026571051051417981446123532550040
May 17, 2026151342567336924412510910000
May 10, 2026217443824191716176840010
May 3, 2026012025010460000
Apr 26, 20269422929251213768680100
Apr 19, 20261131642227210381184000
Apr 12, 202612516142015947120000
Apr 5, 202652449537629191169210010
Mar 29, 2026151815435632252041286214000
Mar 22, 20269288484843118338243922100
Mar 15, 202692531065321518145728014926020
Mar 8, 20260879292321184032749336000
Mar 1, 2026012322120494900000
Feb 22, 202600000000000000
Feb 15, 202600000000000000
Feb 8, 202600000000000000
Feb 1, 2026015418140424100010
Jan 25, 202602011408800000
Jan 18, 20260901419242400000
Jan 11, 202622252214818010910900000
Jan 4, 20260000222723727100010
Jan 1, 20260000000000

Contributions per year

2011 to Nov 12, 2026

Activity in public and private repositories combined.

  • Public repositories
  • Private repositories
View as table
YearTotalPublic repositoriesPrivate repositories
202615,9981,23914,759
2025541
202421615
2023762452
2022451728
2021681751
2020494336158
2019410103307
20181,022405617
20171,037593444
20161,270585685
20152,2321,643589
20142,6401,5871,053
20131,6381,064574
2012854626228
2011551243

Contributions by type

Jan 1, 2026 to Nov 12, 2026

Counts for each type of activity.

  • Commits11,259
  • Pull requests4,555
  • Issues150
  • Repositories created27
  • Reviews6
  • Other1
  • Public repositories
  • Private repositories

Other is activity that does not appear in the lists by type, and it is not split into public and private.

View as table
TypeTotalPublic repositoriesPrivate repositories
Commits11,25980310,456
Pull requests4,5554294,126
Issues1501149
Repositories created27324
Reviews624
Other1

Merged pull requests

Jan 2026 to Nov 2026

Pull requests I opened that were merged, by month.

  • Public repositories
  • Private repositories
  • Months yet to come
Total
4,165
Repositories
24
Time to merge
5 minMedian
Lines changed
121linesMedian
View as table
MonthTotalPublic repositoriesPrivate repositoriesRepositoriesMedian time to mergeMedian lines changedMedian files changed
Nov 202633396237914 min1296
Oct 20268891946951511 min2228
Sep 202661514601817 min2448
Aug 2026463046377 min896
Jul 202664348595110 min494
Jun 20264567338382 min1023
May 2026440044051 min1513
Apr 20261130113215 min793
Mar 20262130213326 min894
Feb 20260000
Jan 20260000

Repository languages

As of Nov 12, 2026

The main language of each repository I created.

  • C55
  • Ruby27
  • TypeScript12
  • Perl5
  • Python5
  • Shell5
  • Rust4
  • TeX3
  • Other languages12
  • Public repositories
  • Private repositories

Excludes 28 repositories for which GitHub detected no language.

View as table
LanguageTotalPublic repositoriesPrivate repositories
C55514
Ruby27270
TypeScript12111
Perl550
Python505
Shell532
Rust440
TeX303
Other languages1284

Repositories

As of Nov 12, 2026

Repositories I created, and public repositories forked from others.

  • Repositories I created156
  • Public forks51
  • Public repositories
  • Private repositories
View as table
TypeTotalPublic repositoriesPrivate repositories
Repositories I created15611739
Public forks51510

Most starred public repositories

As of Nov 12, 2026. 2,727 stars in total

  • ngx_mruby

    ngx_mruby - A Fast and Memory-Efficient Web Server Extension Mechanism Using Scripting Language mruby for nginx

    Language
    C
    Stars
    998
    Last updated
    Nov 11, 2026

  • rcon

    rcon is a lightweight resource virtualization tool for linux processes. This is one-binary.

    Language
    Ruby
    Stars
    378
    Last updated
    Sep 10, 2021

  • mod_mruby

    mod_mruby: A Fast and Memory-Efficient Apache httpd Extension Mechanism Scripting with mruby

    Language
    C
    Stars
    204
    Last updated
    Jun 26, 2020

  • trusterd

    Trusterd: High Performance HTTP/2 Web Server scripting with mruby

    Language
    Ruby
    Stars
    172
    Last updated
    Apr 5, 2019

  • http-dos-detector

    detect huge number of http access like DoS for Apache and nginx using mruby

    Language
    Ruby
    Stars
    91
    Last updated
    May 16, 2017

  • pmilter

    Pmilter: Programmable Mail Filter Server Scripting with mruby

    Language
    C++
    Stars
    80
    Last updated
    Feb 4, 2018

Recently updated public repositories

As of Nov 12, 2026

  • claude-desktop-switcher

    Claude Desktop + CLI context synchronization tool for multi-account environments

    Language
    Rust
    Stars
    30
    Last updated
    Nov 9, 2026

  • mruby-redis

    redis class for mruby.

    Language
    C
    Stars
    54
    Last updated
    Oct 29, 2026

  • mruby-uname

    system uname bindings

    Language
    C
    Stars
    1
    Last updated
    Oct 29, 2026

  • minecraft-vault-hunters-3-japanese-translation

    Vault Hunters 3rd Editionを日本語で遊べるようにする非公式翻訳mod (Minecraft 1.18.2 / Forge). Unofficial Japanese localization mod. Translations only.

    Language
    Java
    Stars
    0
    Last updated
    Aug 17, 2026

  • nextjs-ai-native-template

    AI-Native開発プロセスを組み込んだNext.js App Routerテンプレート

    Language
    TypeScript
    Stars
    0
    Last updated
    Mar 14, 2026

  • mruby-mrbgem-template

    mrbgem template generater

    Language
    Ruby
    Stars
    36
    Last updated
    Aug 13, 2025

See all public repositories on GitHub

The numbers in this section were retrieved on Nov 12, 2026. For private repositories, only aggregated counts are shown.

R&D output

2011 to 2026

Papers, talks, articles, and awards and honors, counted by year and by category.

Counts by year

2011 to 2026

Includes co-authored papers and awards given to them.

  • Papers
  • Talks
  • Articles and interviews
  • Awards and honors
  • Articles on The Future of Humans, AI, and the Web
Total
351
Listed works
279
Site articles
72
Busiest year
722026

Of the 284 items in the list of works, 5 are not counted here. They are in these categories: Grants and research funding, Undergraduate research. Site articles are the articles on The Future of Humans, AI, and the Web, a site I run personally.

View as table
YearPapersTalksArticles and interviewsAwards and honorsArticles on The Future of Humans, AI, and the WebTotal
202600007272
2025021003
2024010001
2023122005
20221450010
202151550025
2020101431028
20191622172057
2018171522036
201782041033
201612171030
201501112014
20143805016
20137505017
2012300003
2011100001

Counts by category

2011 to 2026

Counts for each category of works and for site articles.

  • Talks in Japan135
  • Articles on The Future of Humans, AI, and the Web72
  • Articles and interviews47
  • Non-refereed papers presented in Japan41
  • Awards19
  • Journal papers11
  • Refereed international conference papers11
  • Refereed papers presented in Japan9
  • Talks outside Japan5
  • Doctoral thesis1

See the list of 284 works

Research and open source

I have researched how to achieve both performance and safety on servers shared by many users.

  • ngx_mruby

    Extends nginx with mruby, a lightweight implementation of the Ruby language. It has been used in production for large-scale hosting and content delivery.

  • mod_mruby

    Brings the idea of extending a server with mruby to Apache. The paper received the Best Paper Award at IOTS2013 of the Information Processing Society of Japan.

  • Trusterd

    A web server built for research, which tried out the HTTP/2 protocol at an early stage. In 2015, it received the 企業賞 at the 7th Fukuoka Ruby Award.

  • FastContainer

    Starts a container on each request and decides its resources on the spot. A concept for a dense hosting platform in which the whole system keeps homeostasis.

Selected awards and honors

  1. Selected for IPSJ-ONE 2016, Information Processing Society of Japan

    One of 19 leading young researchers in Japan who are in step with the times

  2. FY2014 IPSJ Yamashita SIG Research Award

    mod_mruby: スクリプト言語で高速かつ省メモリに拡張可能なWebサーバの機能拡張支援機構

  3. Ruby Prize 2014 final nominee

    Recognized for realizing the use of mruby in HTTP server software

  4. 9th Japan OSS Encouragement Award

    For contributing to the development and spread of open source software, including releasing research results as open source while in the doctoral program

See the list of 284 works, including 19 awards

Biography

As of Nov 2026

Text you can use as is for speaker and author introductions.

Long bio

1,204 characters

Ryosuke Matsumoto holds a Doctor of Informatics from Kyoto University and is Chief Researcher at SAKURA internet Research Center. He joined a hosting company in 2008, and in 2012 he entered the doctoral program at the graduate school of Kyoto University, skipping the master's program. He has worked on research in internet infrastructure technology and developed open source software such as mod_mruby and ngx_mruby. From April 2015 he served as Chief Engineer at GMO Pepabo, Inc. and as Chief Researcher of Pepabo R&D Institute, and he has held his current position since November 2018. He began streaming games in 2023. Since July 2026 he has run the R&D platform The Future of Humans, AI, and the Web as a personal activity. He works full-time at SAKURA internet Inc. and, in his personal time outside that work, serves as Representative Director and CTO at Normantics, researching and developing data and tools for AI, from legal information to everyday choices. He received the 9th Japan OSS Encouragement Award and the FY2014 IPSJ Yamashita SIG Research Award, and in 2016 he was selected for IPSJ-ONE of the Information Processing Society of Japan as one of 19 leading young researchers in Japan.

Short bio

747 characters

Ryosuke Matsumoto holds a Doctor of Informatics from Kyoto University and is Chief Researcher at SAKURA internet Research Center. He has worked on research in internet infrastructure technology and developed open source software such as mod_mruby and ngx_mruby. His awards include the 9th Japan OSS Encouragement Award and the FY2014 IPSJ Yamashita SIG Research Award. He began streaming games in 2023. Since July 2026 he has run the R&D platform The Future of Humans, AI, and the Web as a personal activity. He works full-time at SAKURA internet Inc. and, in his personal time outside that work, serves as Representative Director and CTO at Normantics, researching and developing data and tools for AI, from legal information to everyday choices.

Contact and links

  • Emailmatsumoto.ryosuke.s10 (at) kyoto-u.jp