Paul Mcmahon
Founder & Representative Director
Tokyo, Japan
Summary
🤩
Rockstar🎓
Top SchoolPaul Mcmahon is a founder and software engineer with 17 years’ experience building developer-facing products and communities in Japan. After arriving on a working-holiday visa in 2006 he helped launch one of Japan’s early commercial Ruby codebases, co-founded Mobalean to help global companies localize their mobile/web services, and scaled Doorkeeper into a major event registration platform that processed over ¥700M before being sold in 2021. He now runs TokyoDev, a job board and community that has helped hire 100+ international engineers in Japan, blending hands-on engineering with marketplace and product experience. An active contributor to the Ruby on Rails ecosystem and the Mobility i18n framework, Paul brings practical expertise in backend architecture, documentation, and translation handling—skills that helped him bridge technical and cross-cultural challenges for international teams.
16 years of coding experience
10 years of employment as a software developer
BSc., Computer Science, BSc., Computer Science at University of VictoriaComputer Science, Computer Science at Langara College
English, Japanese
Stackoverflow
1,280reputation
110kreached
15answers
8questions
Github Skills (27)
application-framework10
ruby-rails10
url-routing10
rubygems10
testing10
app-framework10
rails10
ruby10
localization10
activerecord10
web-framework10
i18n-node9
postgresql9
documentation9
i18next9
Programming languages (10)
Github contributions (5)
rails/rails
Jul 2018 - Dec 2019
Ruby on Rails
Role in this project:
Back-end Developer
Back-end DeveloperContributions:8 commits, 10 PRs, 11 comments in 1 year 4 months
Contributions summary:Paul primarily contributed to the Rails framework by updating documentation, specifically related to routing and security. They also refactored and optimized code related to class inheritance and object space manipulation. Furthermore, the user added tests to the Mail gem and updated links to https. These changes demonstrate expertise in the Rails framework's internal workings and a focus on improving documentation and code efficiency.
ruby-on-railsrailsframeworkrubymvc
shioyama/mobility
Sep 2017 - Sep 2017
Pluggable Ruby translation framework
Role in this project:Back-end Developer
Back-end DeveloperContributions:7 commits, 8 PRs, 2 pushes in 23 days
Contributions summary:Paul primarily focused on enhancing the functionality and stability of the Mobility translation framework. Their contributions include fixing initialization errors, adding support for backend features, and ensuring proper cache key invalidation upon translation updates. They also introduced testing for duping models, including the addition of various testing examples. These changes improved the framework's ability to handle translated content across various backends and ORMs.
sequelruby-gemjsonbrailstranslation
Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.