Keisuke Sato
CTO at Katteba LLC.
Kushiro, Hokkaido Prefecture, Japan
Summary
👤
Senior🎓
Top SchoolKeisuke Sato is a seasoned technology leader and hands-on software engineer with 17 years of experience building product and platform teams from startup to scale. As CTO of k-Hack and former CTO of Otobank—where he helped launch audiobook.jp—he blends strategic product vision with deep full-stack engineering across PHP, TypeScript, Ruby, React, and Google Cloud. He co-founded a social-marketing startup acquired by Yahoo Japan, founded Katteba LLC, and now shapes infrastructure and reliability as a principal engineer at Star Festival. An active open-source contributor, his work on projects like the Crowi markdown wiki highlights practical backend and frontend improvements (Redis sessions, modular file uploads, local storage support). Based in Kushiro, Hokkaido, he pairs technical leadership with community-building, organizing programming contests for youth and promoting local revitalization. That combination of operational rigor, startup founding experience, and grassroots engagement makes him a pragmatic CTO who still writes production code.
17 years of coding experience
12 years of employment as a software developer
Bachelor, Electrical and Electronic Engineering, Bachelor, Electrical and Electronic Engineering at Kitami Institute of Technology
Japanese
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (11)
nodejs10
javascript10
expressjs10
file-upload10
redis10
typescript-types9
mongodb-database9
mongodb9
typescript9
typescripts9
aws8
Programming languages (6)
Github contributions (5)
crowi/crowi
Oct 2014 - Mar 2016
Crowi - The Markdown Wiki - Empower the team with sharing your knowledge
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:8 commits, 2 PRs, 1 comment in 1 year 5 months
Contributions summary:Keisuke's contributions focused on enhancing the application's backend and frontend. They added Redis session support, fixed a regular expression in a Google-Auth form, and added rules for creatable names. The user also modularized file uploads and added support for local storage. Furthermore, they modified the attachment routes and models, incorporating the new file upload functionalities.
knowledgejavascriptsharingcrowiempower
riaf/dotfiles
Nov 2017 - Nov 2023
Contributions:2 PRs, 32 pushes, 4 branches in 6 years 1 month
dotfilesafxdotbotzsh
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