Koichiro Ohba
VP Of Engineering at 株式会社 Speee
Chiyoda, Japan
Summary
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SeniorKoichiro Ohba is a seasoned engineering leader with 19 years of experience, currently serving as VP of Engineering at Speee in Tokyo's Chiyoda ward. He combines deep hands-on expertise in Ruby and JRuby—highlighted by his JRuby commitorship and contributions to the msgpack-ruby project—with broad platform and cloud experience from roles as CIO of CrowdWorks and system architect at CTC. Koichiro has repeatedly scaled engineering organizations and products across consumer, gaming, and cloud domains while advising multiple startups, demonstrating both strategic leadership and technical mentorship. His background spans languages and runtimes from C/C++ and Java to Clojure, and he has a practical knack for adapting JVM-based libraries (e.g., MessagePack) to work efficiently in JRuby environments.
19 years of coding experience
19 years of employment as a software developer
Github Skills (4)
jruby10
javas10
msgpack10
java10
Programming languages (5)
Github contributions (5)
msgpack/msgpack-ruby
Aug 2011 - Sep 2011
MessagePack implementation for Ruby / msgpack.org[Ruby]
Role in this project:
Back-end Developer
Back-end DeveloperContributions:10 commits in 15 days
Contributions summary:Koichiro primarily contributed to the Java implementation of the msgpack library for JRuby. Their work involved importing and integrating JRuby native support, which included modifications to core Java classes like `MessagePackOutputStream`, `RubyMessagePackUnpacker`, and `MsgpackService`. They also addressed path issues and cleaned up unused imports within the Java code. These changes suggest a focus on enhancing the library's compatibility and performance with the JRuby runtime environment.
msgpackrubymessagepack
koichiro/git-daily
Feb 2012 - Nov 2020
git-daily is a tool which helps you to do daily workflow easier on Git. for ruby version.
Contributions:20 commits, 14 PRs, 12 pushes in 8 years 10 months
to-dorubyworkflow
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